document_title: Secretary of state (U.S. state government)

question_text: who performs the secretarial duties for the states of massachusetts pennsylvania and virginia

text: Duties[edit]

text: The actual duties of a secretary of state vary widely from state to state. In most states, the secretary of state's office is a creation of the original draft of the state constitution. However, in many cases responsibilities have been added by statute or executive order.

text: Duties in most states[edit]

text: The most common, and arguably the most important, function held by secretaries of state is to serve as the state's chief elections official (although many states also have supervisors of elections, which are usually county elected officials). In 38 states, ultimate responsibility for the conduct of elections, including the enforcement of qualifying rules, oversight of finance regulation and establishment of Election Day procedures falls on the secretary of state. The exceptions are Alaska, Delaware, Hawaii, Illinois, Maryland, New York, North Carolina, Oklahoma, South Carolina, Utah, Virginia and Wisconsin.[6]

text: Florida is one of the many states for which this is true, and for this reason Florida Secretary of State Katherine Harris became one of the few state secretaries of state to become well known during the Florida election recount.

text: In the vast majority of states, the secretary of state is also responsible for the administration of the Uniform Commercial Code, an act which provides for the uniform application of business contracts and practices across the United States, including the registration of liens on personal property. Hand in hand with this duty, in most states the Secretary of State is responsible for state trademark registration and for chartering businesses (usually including partnerships and corporations) that wish to operate within their state. Accordingly, in most states, the secretary of state also maintains all records on business activities within the state. And in some states, the secretary of state has actual wide-ranging regulatory authority over businesses as well.

text: In addition to business record, the secretary of state's office is the primary repository of official records in perhaps a majority of states. This includes in most states the official copies of state documents including the actual official copy of the state constitution (and in Delaware, the state-owned copy of the United States Bill of Rights[7]) formal copies of legislative acts enacted into law, executive orders issued by the governor, and regulations and interpretations of statutes issued by state regulatory agencies. In at least a half-dozen states, this record keeping authority extends to civil acts, such as marriages, birth certificates, and adoption and divorce decrees. Many states also require the secretary of state's office to also maintain records of land transactions and ownership.

text: In at least 35 states, the secretary of state is also responsible for the administration of notaries public. And almost all states also designate (almost always in the state constitution itself) that the Secretary of State shall be the "Keeper of the Great Seal" of the state. Ostensibly this requires the secretary to make decisions as to where the state seal shall be affixed, whether it be onto legislation, state contracts, or other official documents.

text: Those states which have address confidentiality programs often place the Secretary of State in charge of administering them.

text: Less common duties[edit]

text: About a dozen states give the secretary of state the task of issuing professional licenses. This includes doctors, plumbers, cosmeticians, general contractors, and, in at least two states, ministers (to perform marriages). In Nevada, Pennsylvania, and West Virginia, the secretary of state must clear anyone who wishes to act as a sports agent for a professional athlete.

text: In several states (including Indiana, Mississippi, Massachusetts, and Wyoming), the secretary of state is responsible for oversight of the securities industry.

text: In Illinois, Maine, and Michigan, the secretary of state is in charge of the issuance of driver's licenses, motor vehicle registrations, and collecting motor vehicle taxes. In many other states, these duties fall under an organization such as departments of motor vehicles, transportation, or state police.

text: In several states the secretary of state is also in charge of monitoring the activities of lobbyists. While some might regard this as a natural extension of the role as chief elections officer, the Secretary of the Commonwealth of Virginia, who is not in charge of elections in that state, is nonetheless responsible for regulating lobbying.

text: In about five states, the secretary of state is the official in charge of the official state museum. In some of these states, and also some states without official museums, the secretary of state is designated as the official with responsibility for maintenance of the state's historical records.

text: A few states put the secretary of state in charge of the use of public property. In most cases, this means only public buildings (usually the state capitol building), but in Mississippi it also includes some lands that are legally defined as belonging to the state, such as tidelands.[8]

text: Several states grant a technical statutory authority to the secretary of state in the realm of pardons and commutations. In most cases, this is nothing more than the responsibility to affix the state seal upon the governor's proclamation. However, in Delaware[9] and Nebraska,[10] the secretary of state sits on a board of pardons with the governor, and the secretary of state commands equal authority with the governor in any pardoning decisions that are issued.

text: Since the early 1980s, many states have increased efforts to develop direct commercial relations with foreign nations. In several of these states, the state's secretary of state has been given primary responsibility in this area. Despite this, there should be no confusion of the duties of a particular state's secretary of state and those of the United States Secretary of State. The prohibition of the United States Constitution[11] against individual states having diplomatic relations with foreign states is absolute; these recently evolved duties are of a purely commercial nature.

text: In Maine and California, in the event of some electoral ties, it is the secretary of state who determines the winner by drawing lots. In California, this does not extend to primary elections, or to the elections of the Governor or the Lieutenant Governor.[12] In Maine, this duty only applies to primary elections.[13]

text: Unique responsibilities[edit]

text: Several states have given their secretary of state at least one responsibility that is shared by no other state's secretary:

text:
In Delaware, the Secretary of State is the official responsible for handling the Delaware Commission of Veterans Affairs.[14]
In Indiana, the Secretary of State is responsible for the regulation of auto dealerships.[15]
In New Jersey, the Secretary of State is in charge of enhancing and building awareness of ethnic diversity. Other duties include promoting volunteerism and literacy.[16]
In New York, the Secretary of State is charged with oversight of the state's thousands of cemeteries.[17] The secretary is also responsible for coastal issues arising under the federal Coastal Zone Management Act.
In North Dakota, in the event of a tie in any election for the state legislature, it is the Secretary of State who tosses the coin to determine the winner.[18]
In Oregon, the Secretary of State is also the Chief Auditor of Public Accounts.[19]
In South Carolina, the Secretary of State is in charge of cable television franchises.[20]
In South Dakota, the Secretary of State is the authority for issuance of concealed weapon permits.[21]
In Puerto Rico, by statute, the Secretary of State chairs the Governor's Advisory Council on Executive Branch Reorganization and Modernization, which drafts the reorganization plans that the governor submits to the legislature for approval.

text: Current secretaries of state[edit]

text:
Officeholder
State
Party
Assumed office
Title

Merrill, JohnJohn Merrill
Alabama
Republican
000000002015-01-19-0000January 19, 2015
Secretary of State

Mallott, ByronByron Mallott
Alaska
Democratic
000000002014-12-16-0000December 16, 2014
Lieutenant Governor

Mauga, LemanuLemanu Mauga
American Samoa
Democratic
000000002013-01-03-0000January 3, 2013
Lieutenant Governor

Reagan, MicheleMichele Reagan
Arizona
Republican
000000002015-01-05-0000January 5, 2015
Secretary of State

Martin, MarkMark Martin
Arkansas
Republican
000000002011-01-11-0000January 11, 2011
Secretary of State

Padilla, AlexAlex Padilla
California
Democratic
000000002015-01-05-0000January 5, 2015
Secretary of State

Williams, WayneWayne Williams
Colorado
Republican
000000002015-01-13-0000January 13, 2015
Secretary of State

Merrill, DeniseDenise Merrill
Connecticut
Democratic
000000002011-01-05-0000January 5, 2011
Secretary of the State

Bullock, JeffreyJeffrey Bullock
Delaware
Democratic
000000002009-01-20-0000January 20, 2009
Secretary of State

Vaughan, LaurenLauren Vaughan
District of Columbia
Democratic
000000002015-01-02-0000January 2, 2015
Secretary of the District

Detzner, KenKen Detzner
Florida
Republican
000000002012-02-17-0000February 17, 2012
Secretary of State

Kemp, BrianBrian Kemp
Georgia
Republican
000000002010-01-08-0000January 8, 2010
Secretary of State

Tenorio, RayRay Tenorio
Guam
Republican
000000002011-01-03-0000January 3, 2011
Lieutenant Governor

Chin, DougDoug Chin
Hawaii
Democratic
000000002018-02-01-0000February 1, 2018
Lieutenant Governor

Denney, LawerenceLawerence Denney
Idaho
Republican
000000002015-01-05-0000January 5, 2015
Secretary of State

White, JesseJesse White
Illinois
Democratic
000000001999-01-11-0000January 11, 1999
Secretary of State

Lawson, ConnieConnie Lawson
Indiana
Republican
000000002012-03-16-0000March 16, 2012
Secretary of State

Pate, PaulPaul Pate
Iowa
Republican
000000002015-01-01-0000January 1, 2015
Secretary of State

Kobach, KrisKris Kobach
Kansas
Republican
000000002011-01-10-0000January 10, 2011
Secretary of State

Grimes, AlisonAlison Grimes
Kentucky
Democratic
000000002012-01-02-0000January 2, 2012
Secretary of State

Schedler, TomTom Schedler
Louisiana
Republican
000000002010-11-22-0000November 22, 2010
Secretary of State

Dunlap, MatthewMatthew Dunlap
Maine
Democratic
000000002013-01-07-0000January 7, 2013
Secretary of State

Wobensmith, JohnJohn Wobensmith
Maryland
Republican
000000002015-01-21-0000January 21, 2015
Secretary of State

Galvin, WilliamWilliam Galvin
Massachusetts
Democratic
000000001995-01-01-0000January 1, 1995
Secretary of the Commonwealth

Johnson, RuthRuth Johnson
Michigan
Republican
000000002011-01-01-0000January 1, 2011
Secretary of State

Simon, SteveSteve Simon
Minnesota
Democratic
000000002015-01-05-0000January 5, 2015
Secretary of State

Hosemann, DelbertDelbert Hosemann
Mississippi
Republican
000000002008-01-10-0000January 10, 2008
Secretary of State

Ashcroft, JayJay Ashcroft
Missouri
Republican
000000002017-01-09-0000January 9, 2017
Secretary of State

Stapleton, CoreyCorey Stapleton
Montana
Republican
000000002017-01-02-0000January 2, 2017
Secretary of State

Gale, JohnJohn Gale
Nebraska
Republican
000000002000-12-01-0000December 2000
Secretary of State

Cegavske, BarbaraBarbara Cegavske
Nevada
Republican
000000002015-01-05-0000January 5, 2015
Secretary of State

Gardner, BillBill Gardner
New Hampshire
Democratic
000000001976-12-01-0000December 1976
Secretary of State

Way, TaheshaTahesha Way
New Jersey
Democratic
000000002018-01-16-0000January 16, 2018
Secretary of State

Toulouse Oliver, MaggieMaggie Toulouse Oliver
New Mexico
Democratic
000000002016-12-09-0000December 9, 2016
Secretary of State

Perales, CesarCesar Perales
New York
Democratic
000000002011-05-02-0000May 2, 2011
Secretary of State

Marshall, ElaineElaine Marshall
North Carolina
Democratic
000000001997-01-01-0000January 1997
Secretary of State

Jaeger, AlAl Jaeger
North Dakota
Republican
000000001993-01-01-0000January 1, 1993
Secretary of State

Hocog, VictorVictor Hocog
Northern Mariana Islands
Republican
000000002015-01-12-0000January 12, 2015
Lieutenant Governor

Husted, JonJon Husted
Ohio
Republican
000000002011-01-10-0000January 10, 2011
Secretary of State

Lopez, DaveDave Lopez
Oklahoma
Republican
000000002017-03-27-0000March 27, 2017
Secretary of State

Richardson, DennisDennis Richardson
Oregon
Republican
000000002017-01-02-0000January 2, 2017
Secretary of State

Cortés, PedroPedro Cortés
Pennsylvania
Democratic
000000002015-01-20-0000January 20, 2015
Secretary of the Commonwealth

Rivera Marín, LuisLuis Rivera Marín
Puerto Rico
New Progressive/
Republican
000000002017-01-02-0000January 2, 2017
Secretary of State

Gorbea, NellieNellie Gorbea
Rhode Island
Democratic
000000002015-01-06-0000January 6, 2015
Secretary of State

Hammond, MarkMark Hammond
South Carolina
Republican
000000002003-01-15-0000January 15, 2003
Secretary of State

Krebs, ShantelShantel Krebs
South Dakota
Republican
000000002015-01-10-0000January 10, 2015
Secretary of State

Hargett, TreTre Hargett
Tennessee
Republican
000000002009-01-15-0000January 15, 2009
Secretary of State

Pablos, RolandoRolando Pablos
Texas
Republican
000000002017-01-06-0000January 6, 2017
Secretary of State

Cox, SpencerSpencer Cox
Utah
Republican
000000002013-10-16-0000October 16, 2013
Lieutenant Governor

Condos, JimJim Condos
Vermont
Democratic
000000002011-01-06-0000January 6, 2011
Secretary of State

Potter, OsbertOsbert Potter
U.S. Virgin Islands
Independent
000000002015-01-05-0000January 5, 2015
Lieutenant Governor

Thomasson, KellyKelly Thomasson
Virginia
Democratic
000000002016-04-15-0000April 15, 2016
Secretary of the Commonwealth

Wyman, KimKim Wyman
Washington
Republican
000000002013-01-16-0000January 16, 2013
Secretary of State

Warner, MacMac Warner
West Virginia
Republican
000000002017-01-16-0000January 16, 2017
Secretary of State

La Follette, DougDoug La Follette
Wisconsin
Democratic
000000001983-01-03-0000January 3, 1983
Secretary of State

Buchanan, EdwardEdward Buchanan
Wyoming
Republican
000000002018-03-01-0000March 1, 2018
Secretary of State


document_title: List of Super Bowl halftime shows

question_text: who played the half time show last year

question_tokens: who played the half time show last year

root

text: List of Super Bowl halftime shows

text: Background[edit]

text: During most of the Super Bowl's first decade, the halftime show featured a college marching band. The show's second decade featured a more varied show, often featuring drill teams and other performance ensembles; the group Up with People produced and starred in four of the performances. The middle of the third decade, in an effort to counter other networks' efforts to counterprogram the game,[7] saw the introduction of popular music acts such as New Kids on the Block, Gloria Estefan, Michael Jackson, Clint Black, Patti LaBelle, and Tony Bennett. Starting with Super Bowl XXXII, commercial sponsors presented the halftime show; within five years, the tradition of having a theme—begun with Super Bowl III—ended, replaced by major music productions by arena rock bands and other high-profile acts. In the six years immediately following an incident at Super Bowl XXXVIII where Justin Timberlake exposed one of Janet Jackson's breasts in an alleged "wardrobe malfunction", all of the halftime shows consisted of a performance by one artist or group, with the musicians in that era primarily being rock artists from the 1960s, 1970s and 1980s. These shows were considered "family friendly" and the time in which they took place has been described as "the age of reactionary halftime shows.[8] Since Super Bowl XLV, the halftime show has returned to featuring popular contemporary musicians, with the typical format featuring a single headline artist collaborating with a small number of guest acts.

tag: p

text: The NFL does not pay the halftime show performers an appearance fee, though it covers all expenses for the performers and their entourage of band members management, technical crew, security personnel, family, and friends.[9] Super Bowl XXVII halftime show with Michael Jackson provided an exception, as the NFL and Frito-Lay agreed to make a donation and provide commercial time for Jackson's Heal the World Foundation.[10][11][12][11] According to Nielsen SoundScan data, the halftime performers regularly experience significant spikes in weekly album sales and paid digital downloads due to the exposure.[13] For Super Bowl XLIX, it was reported by the Wall Street Journal that league officials asked representatives of potential acts if they would be willing to provide financial compensation to the NFL in exchange for their appearance, in the form of either an up-front fee, or a cut of revenue from concert performances made after the Super Bowl. While these reports were denied by an NFL spokeswoman, the request had, according to the Journal, received a "chilly" response from those involved.[14][15]

text: History[edit]

text: The following is a list of the performers, producers, themes, and sponsors for each Super Bowl game's show.

text:
Super Bowl
Show details

I

Date: Jan 15, 1967
Location: Los Angeles Memorial Coliseum (University Park, Los Angeles, California)
Performers: University of Arizona Symphonic Marching Band & Grambling State University Marching Band, Al Hirt, Anaheim High School Drill Team and Flag Girls
Producer: Tommy Walker
Setlist: "The Liberty Bell" (The University of Arizona Symphonic Marching Band)
References:[16][17][18]

II

Date: Jan 14, 1968
Location: Miami Orange Bowl (Miami, Florida)
Performers: Grambling State University Marching Band
References:[16]

III

Date: Jan 12, 1969
Location: Miami Orange Bowl (Miami, Florida)
Theme: America Thanks
Performers: Florida A&M University and Miami area High School Bands
References:[16]

tag: table

text:
Super Bowl
Show details

IV

Date: Jan 11, 1970
Lon: Tulane Stadium (New Orleans, Louisiana)
Theme: Tribute to Mardi Gras
Performers: Marguerite Piazza, Doc Severinsen, Al Hirt, Lionel Hampton Southern University Marching Band
References:[16]
Setlist:

"When the Saints Go Marching In"

V

Date: Jan 17, 1971
Location: Miami Orange Bowl (Miami, Florida)
Performers: Southeast Missouri State Marching Band
References:[16][19]

VI

Date: Jan 16, 1972
Location: Tulane Stadium (New Orleans, Louisiana)
Theme: Salute to Louis Armstrong
Performers: Ella Fitzgerald, Carol Channing, Al Hirt, USAFA Cadet Chorale, & U.S. Marine Corps Drill Team
Producer: Jim Skinner
References:[16][20]
Setlist:

"Mack the Knife" (Ella Fitzgerald and Al Hirt)

VII

Date: Jan 14, 1973
Location: Los Angeles Memorial Coliseum (University Park, Los Angeles, California)
Theme: Happiness Is
Performers: University of Michigan Marching Band & Woody Herman & Andy Williams
Producer: Tommy Walker
References:[16][21][22]
Setlist: (partial)

"Put on a Happy Face" (University of Michigan Marching Band)
"La Virgen de la Macarena" (University of Michigan Marching Band)
"This Land Is Your Land" (University of Michigan Marching Band)
"Marmalade, Molasses & Honey" (Andy Williams)
"People" (Andy Williams)

VIII

Date: Jan 13, 1974
Location: Rice Stadium (Houston, Texas)
Theme: A Musical America
Performers: University of Texas Longhorn Band and Judy Mallett (Miss Texas 1973) on fiddle
Producer: Jim Skinner
References:[16]

IX

Date: Jan 12, 1975
Location: Tulane Stadium (New Orleans, Louisiana)
Theme: Tribute to Duke Ellington
Performers: Mercer Ellington & Grambling State University Marching Bands
Producer: Jim Skinner
References:[16][18]

X

Date: Jan 18, 1976
Location: Miami Orange Bowl (Miami, Florida)
Theme: 200 Years and Just a Baby: A Tribute to America's Bicentennial
Performer: Up with People
References:[16][23]

XI

Date: Jan 9, 1977
Location: Rose Bowl (Pasadena, California)
Theme: It's a Small World
Performers: Los Angeles Unified All-City Band & Audience card stunt
Producer: The Walt Disney Company
References:[16]

XII

Date: Jan 15, 1978
Location: Louisiana Superdome (New Orleans, Louisiana)
Theme: From Paris to Paris of America
Performers: Tyler Apache Belles Drill Team, and Apache Band Pete Fountain & Al Hirt
References:[16]

XIII

Date: Jan 21, 1979
Location: Miami Orange Bowl (Miami, Florida)
Theme: Salute to Caribbean
Performers: Ken Hamilton, various Caribbean bands including Grammacks out of Dominica
Producer: Bob Jani
Sponsor: Carnival
References:[16]

text:
Super Bowl
Show details

XIV

Date: Jan 20, 1980
Location: Rose Bowl (Pasadena, California)
Theme: A Salute to the Big Band Era
Performers: Up with People, Grambling State University Marching Bands
References:[16][23]

XV

Date: Jan 25, 1981
Location: Louisiana Superdome (New Orleans, Louisiana)
Theme: Mardi Gras Festival
Performers: Southern University Marching Band, Helen O'Connell
Producer: Jim Skinner
References:[16]

XVI

Date: Jan 24, 1982
Location: Pontiac Silverdome (Pontiac, Michigan)
Theme: Salute to the 1960s and Motown
Performer: Up with People
References:[16][23]

XVII

Date: Jan 30, 1983
Location: Rose Bowl (Pasadena, California)
Theme: KaleidoSUPERscope
Performer: Los Angeles Super Drill Team
Producer: Bob Jani
References:[16]

XVIII

Date: Jan 22, 1984
Location: Tampa Stadium (Tampa, Florida)
Theme: Salute to Superstars of Silver Screen
Performers: University of Florida and Florida State University Marching Bands
Producer: The Walt Disney Company
Setlist:[16]

Introduction by Phyllis George
"Hooray for Hollywood"
"You Oughta Be in Pictures"
"Steppin' Out with My Baby"
"Puttin' on the Ritz"
"42nd Street"
"When You Wish Upon a Star"

XIX

Date: Jan 20, 1985
Location: Stanford Stadium (Stanford, California)
Theme: World of Children's Dreams
Performer: Tops In Blue
Producer: Air Force Entertainment
References:[16]

XX

Date: Jan 26, 1986
Location: Louisiana Superdome (New Orleans, Louisiana)
Theme: Beat of the Future
Performer: Up with People
References:[16][23]

XXI

Date: Jan 25, 1987
Location: Rose Bowl (Pasadena, California)
Theme: Salute to Hollywood's 100th Anniversary - The World of Make Believe
Performers: George Burns, Mickey Rooney, Grambling State University and USC Marching Bands, Disney characters, Southern California-area high school drill teams and dancers
Producer: The Walt Disney Company
References:[16]
Setlist:

"Ghost Riders in the Sky"
Theme songs from Bonanza, Indiana Jones, and Footloose
Hoedown song
"Cheek to Cheek"
"What a Feeling" (Theme from Flashdance)
"That's Entertainment"
"Somewhere Over the Rainbow"
"When You Wish Upon a Star"

XXII

Date: Jan 31, 1988
Location: Jack Murphy Stadium (San Diego, California)
Theme: Something Grand
Performers: Chubby Checker, The Rockettes, 88 grand pianos, and the combined San Diego State University Marching Aztecs and USC Marching Bands
Producer: Radio City Music Hall
References:[16][17]

XXIII

Date: Jan 22, 1989
Location: Joe Robbie Stadium (Miami Gardens, Florida)
Theme: 1950's Rock and Roll (Be Bop Bamboozled in 3-D)
Performers: Elvis Presto, South Florida-area dancers and performers
Producer: MagicCom Entertainment, Dan Witkowski
Sponsor: Diet Coke
Setlist:

Introduction by Bob Costas and 3-D commercial for Diet Coke
"Rock This Town"
audience participation card trick
"Tutti Frutti"
"Do You Love Me"
"Devil with a Blue Dress On"
"Great Balls of Fire"
"Greased Lightnin'"
"True Love"

References:[16][24]

text:
Super Bowl
Show details

XXIV

Date: Jan 28, 1990
Location: Louisiana Superdome (New Orleans, Louisiana)
Theme: Salute to New Orleans & 40th Anniversary of Peanuts
Performers: Pete Fountain, Doug Kershaw, Irma Thomas, Nicholls State University Marching Band, Southern University Marching Band, USL Marching Band
Producer: Select Productions
References:
Setlist:

"(Up A) Lazy River"
"Waiting For The Robert E. Lee"
"Here Comes the Showboat"
"When the Saints Go Marching In" (Pete Fountain on clarinet)
"Happy Birthday to You"

XXV

Date: Jan 27, 1991
Location: Tampa Stadium (Tampa, Florida)
Theme: Small World Tribute to 25 Years of the Super Bowl
Performers: New Kids on the Block (NKOTB), Disney characters, Warren Moon, 2,000 local children, audience card stunt
Producer: The Walt Disney Company
Sponsor: Walt Disney World and Coca-Cola
References:[16]
Setlist:

"It's a Small World After All"/ "We Are the World"/ "I'd Like to Teach the World to Sing" (children)
"Step by Step" (NKOTB)
"This One's For The Children" (NKOTB and children)
"It's a Small World After All" (children)

Notes: The airing of this halftime show was delayed until after the conclusion of the game due to ABC News coverage of Operation Desert Storm

XXVI

Date: Jan 26, 1992
Location: Hubert H. Humphrey Metrodome (Minneapolis, Minnesota)
Theme: Winter Magic, salute to 1992 Winter Olympics
Performers: Gloria Estefan, Olympic Figure skaters Brian Boitano and Dorothy Hamill, members of the 1980 US Olympic Hockey Team, and the University of Minnesota Marching Band
Producer: Timberline Productions
References:[16]
Setlist:

"Winter Magic"
"Walking in a Winter Wonderland"
"Dance of the Sugar Plum Fairy"
"Frosty" (University of Minnesota Marching Band)
"One Moment in Time" (featuring Brian Boitano and Dorthy Hamill)
"Don't Stop Me Now" (featuring members of the 1980 US Olympic Hockey Team)
"Live for Loving You" (Gloria Estefan)
"Get on Your Feet" (Gloria Estefan)

Notes: During the halftime, rival network Fox aired a special live episode of In Living Color, one of the first deliberate attempts at counter-programming. The show drew over 22 million viewers away from the Super Bowl telecast.[citation needed] In mid-1992, citing this, Select Productions pitched the concept of exclusively featuring live concert-type performances from top contemporary musical artists.[citation needed] The concept and pitch is attributed to Select Productions' employee Rick Lewis and prompted the change of the 1993 halftime show to showcase Michael Jackson.[citation needed]

XXVII

Main article: Super Bowl XXVII halftime show

Date: Jan 31, 1993
Location: Rose Bowl (Pasadena, California)
Performer: Michael Jackson
Producer: Radio City, Scott Sanders and Don Mischer Productions
References:[16][17]
Setlist:

"Jam" (M. Jackson)
"Billie Jean" (M. Jackson)
"Black or White" (M. Jackson)
"We Are the World" (children's choir)
"Heal the World" (M. Jackson)

Notes: This halftime performance increased the TV ratings by a significant amount. It has been claimed to be one of the most watched events in American television history. After 1993, the NFL made a deliberate effort to attract top performers for the halftime shows.[25]

XXVIII

Date: Jan 30, 1994
Location: Georgia Dome (Atlanta, Georgia)
Theme: Rockin' Country Sunday
Performers: Clint Black, Tanya Tucker, Travis Tritt, The Judds
Producer: Select Productions
References:[16]
Setlist:

"Tuckered Out" (Clint Black)
"It's a Little Too Late" (Tanya Tucker)
"T-R-O-U-B-L-E" (Travis Tritt)
"No One Else on Earth" (Wynonna Judd)
"Love Can Build a Bridge" (The Judds, joined by the other artists and special guests for the final verse)

Notes: Travis Tritt of Atlanta, joined several other artists in history to perform in the halftime show in his own hometown. The special guests for the finale included: Stevie Wonder, Ashley Judd, Lisa Hartman Black, The Georgia Satellites, Joe Namath, Elijah Wood, and Charlie Daniels.

XXIX

Date: Jan 29, 1995
Location: Joe Robbie Stadium (Miami Gardens, Florida)
Theme: Indiana Jones and the Temple of the Forbidden Eye
Performers: Patti Labelle, Indiana Jones & Marion Ravenwood, Teddy Pendergrass, Tony Bennett, Arturo Sandoval, Miami Sound Machine
Producer: The Walt Disney Company
References:[16]
Setlist:

"Release Yourself" (Patti Labelle)
"Caravan" (Tony Bennett, Arturo Sandoval and Miami Sound Machine)
"New Attitude" (Patti Labelle)
"Can You Feel The Love Tonight" (Patti Labelle and Tony Bennett)

XXX

Date: Jan 28, 1996
Location: Sun Devil Stadium (Tempe, Arizona)
Theme: Take Me Higher: A Celebration of 30 Years of the Super Bowl
Performer: Diana Ross
Producer: Radio City Music Hall
Sponsor: Oscar Mayer
References:[16][17]
Setlist: A medley of the following songs:

"Stop In The Name Of Love"
"You Keep Me Hangin' On"
"Baby Love"
"You Can't Hurry Love"
"Why Do Fools Fall in Love"
"Chain Reaction"
"Reach Out and Touch (Somebody's Hand)"
"Ain't No Mountain High Enough"
"I Will Survive"
"Take Me Higher"

XXXI

Date: Jan 26, 1997
Location: Louisiana Superdome (New Orleans, Louisiana)
Theme: Blues Brothers Bash
Performers: The Blues Brothers (Dan Aykroyd, John Goodman and James Belushi), ZZ Top, James Brown, Catherine Crier ("news" intro)
Producer: Select Productions, Radio City, House of Blues
Sponsor: Oscar Mayer
References:[16]
Setlist:

"Everybody Needs Somebody to Love" (The Blues Brothers)
"Soul Man" (The Blues Brothers)
"I Got You (I Feel Good)" (James Brown)
"Get Up (I Feel Like Being a) Sex Machine" (James Brown)
"Tush" (ZZ Top)
"Legs" (ZZ Top)
"Gimme Some Lovin'" (all performers joined together)

XXXII

Date: Jan 25, 1998
Location: Qualcomm Stadium (San Diego, California)
Theme: Salute to Motown's 40th Anniversary
Performers: Boyz II Men, Smokey Robinson, Martha Reeves, The Temptations, Queen Latifah, Grambling State University Marching Band
Producer: Radio City Music Hall
Sponsor: Royal Caribbean International & Celebrity Cruises
References:[16][17][18][26]
Setlist:

"Get Ready" (The Temptations)
"I Can't Help Myself" (The Temptations)
"The Tracks of My Tears" (Smokey Robinson)
"My Girl" (The Temptations with Smokey Robinson)
"Heat Wave" (Martha and the Vandellas)
"Paper" (Queen Latifah)
"Motownphilly" (Boyz II Men)
"A Song for Mama" (Boyz II Men)
"Dancing in the Street" (all artists joined by GSU Marching Band)

XXXIII

Date: Jan 31, 1999
Location: Pro Player Stadium (Miami Gardens, Florida)
Theme: Celebration of Soul, Salsa and Swing
Performers: Gloria Estefan, Stevie Wonder, Big Bad Voodoo Daddy, Savion Glover
Producer: Radio City Music Hall
Sponsor: Progressive Auto Insurance
References:[16]
Setlist:

"Go Daddy O" (Big Bad Voodoo Daddy)
"Sir Duke" (Stevie Wonder)
"You Are The Sunshine Of My Life" (Stevie Wonder)
"I Wish" (Stevie Wonder)
"Oye!" (Gloria Estefan)
"Turn The Beat Around" (Gloria Estefan)
"You'll Be Mine (Party Time)/Another Star/My Cherie Amour" (Gloria Estefan and Stevie Wonder)

text:
Super Bowl
Show details

XXXIV

Date: Jan 30, 2000
Location: Georgia Dome (Atlanta, Georgia)
Theme: Tapestry of Nations
Performers: Phil Collins, Christina Aguilera, Enrique Iglesias, Toni Braxton, 80-person choir, Edward James Olmos (narrator)
Producer: Disney
Sponsor: E-Trade
References:[16][27]
Setlist:

"Reflections of Earth" Instrumental (Walt Disney World Millennium Celebration soundtrack)
"Celebrate the Future Hand in Hand" (Christina Aguilera & Enrique Iglesias)
"Tapestry of Nations" Instrumental (Walt Disney World Millennium Celebration soundtrack)
"Two Worlds" (Phil Collins)
"We Go On" (Toni Braxton)

XXXV

Date: Jan 28, 2001
Location: Raymond James Stadium (Tampa, Florida)
Theme: The Kings of Rock and Pop
Performers: Aerosmith, 'N Sync, Britney Spears, Mary J. Blige, Nelly
Producer: MTV
Sponsor: E-Trade
References:[16][17]
Setlist:

Pre-recorded intro sketch with Ben Stiller, Adam Sandler, Chris Rock, Aerosmith, and 'N Sync
"Bye Bye Bye" ('N Sync)
"I Don't Want to Miss a Thing" (Aerosmith)
"It's Gonna Be Me ('N Sync)
"Jaded" (Aerosmith)
"Walk This Way" (Aerosmith, 'N Sync, Britney Spears, Mary J. Blige, Nelly)

XXXVI

Date: Feb 3, 2002
Location: Louisiana Superdome (New Orleans, Louisiana)
Theme: Tribute to those killed in the September 11 attacks
Performer: U2
Producer: Clear Channel Entertainment
Sponsor: E-Trade
References:[16][17]
Setlist:

"Beautiful Day"
"MLK"
"Where the Streets Have No Name"

XXXVII

Date: Jan 26, 2003
Location: Qualcomm Stadium (San Diego, California)
Performers: Shania Twain, No Doubt, Sting
Producer: Jimmy Iovine and Joel Gallen
Sponsor: AT&T Wireless
References:[16]
Setlist:

"Man! I Feel like a Woman!" (Shania Twain)
"Up!" (Shania Twain)
"Just a Girl" (No Doubt)
"Message in a Bottle" (Sting with No Doubt)

XXXVIII

Date: Feb 1, 2004
Location: Reliant Stadium (Houston, Texas)
Theme: Choose or Lose
Performers: Jessica Simpson, the Spirit of Houston from the University of Houston, and the Ocean of Soul of Texas Southern University marching bands, Janet Jackson, P. Diddy, Nelly, Kid Rock and Justin Timberlake
Producer: MTV
Sponsor: AOL TopSpeed
References:[16][17]
Setlist:[28]

'Choose to Party!' Intro (Jessica Simpson)
Marching bands
"All for You" (Janet Jackson)
"Bad Boy for Life" (P. Diddy)
"Diddy" to the tune of "Mickey" (P. Diddy)
"Hot in Herre" (Nelly),
"Mo Money Mo Problems" (P. Diddy)
"Bawitdaba" (Kid Rock),
"Cowboy" (Kid Rock)
"Rhythm Nation" (Janet Jackson)
"Rock Your Body" (Justin Timberlake with Janet Jackson)

Further information: Super Bowl XXXVIII halftime show controversy

XXXIX

Date: Feb 6, 2005
Location: Alltel Stadium (Jacksonville, Florida)
Performer: Paul McCartney
Producer: Don Mischer Productions
Sponsor: Ameriquest Mortgage
References:[16]
Setlist:

"Drive My Car"
"Get Back"
"Live and Let Die"
"Hey Jude"

XL

Date: Feb 5, 2006
Location: Ford Field (Detroit, Michigan)
Performer: The Rolling Stones
Producer: Don Mischer Production
Sponsor: Sprint Nextel
References:[16][17]
Setlist:

"Start Me Up"
"Rough Justice"
"(I Can't Get No) Satisfaction"

XLI

Date: Feb 4, 2007
Location: Dolphin Stadium (Miami Gardens, Florida)
Performers: Prince, Florida A&M University Marching 100 Band
Producer: Don Mischer Productions and White Cherry Entertainment
Sponsor: Pepsi
References:[16][17]
Setlist:

"We Will Rock You" (Intro)
"Let's Go Crazy"
"Baby I'm a Star"
"Proud Mary"
"All Along the Watchtower"
"Best of You"
"Purple Rain"

XLII

Date: Feb 3, 2008
Location: University of Phoenix Stadium (Glendale, Arizona)
Performer: Tom Petty & the Heartbreakers
Producer: Don Mischer Productions and White Cherry Entertainment
Sponsor: Bridgestone
References:[16]
Setlist:

"American Girl"
"I Won't Back Down"
"Free Fallin'"
"Runnin' Down a Dream"

XLIII

Date: Feb 1, 2009
Location: Raymond James Stadium (Tampa, Florida)
Performers: Bruce Springsteen and the E Street Band
Producer: Don Mischer Productions and White Cherry Entertainment
Sponsor: Bridgestone
References:[16]
Setlist:

"Tenth Avenue Freeze-Out"
"Born to Run"
"Working on a Dream"
"Glory Days"

text:
Super Bowl
Show details

XLIV

Date: Feb 7, 2010
Location: Sun Life Stadium (Miami Gardens, Florida)
Performer: The Who
Producer: White Cherry Entertainment
Sponsor: Bridgestone
References:[16]
Setlist:

"Pinball Wizard"
"Baba O'Riley"
"Who Are You"
"See Me, Feel Me"
"Won't Get Fooled Again"

XLV

Date: Feb 6, 2011
Location: Cowboys Stadium (Arlington, Texas)
Performers: The Black Eyed Peas, Usher, Slash, Dallas/Ft. Worth-area area high school drill teams and dancers
Producer: Ricky Kirshner
Sponsor: Bridgestone
References:[16]
Setlist:[29]

"I Gotta Feeling" (The Black Eyed Peas)
"Boom Boom Pow" (The Black Eyed Peas)
"Sweet Child O' Mine" (Slash & Fergie)
"Pump It" (The Black Eyed Peas)
"Let's Get It Started" (The Black Eyed Peas)
"OMG" (Usher & will.i.am)
"Where Is The Love?" (The Black Eyed Peas)
"The Time (Dirty Bit)" with "I Gotta Feeling" reprise (The Black Eyed Peas)

XLVI

Main article: Super Bowl XLVI halftime show

Date: Feb 5, 2012
Location: Lucas Oil Stadium (Indianapolis, Indiana)
Performers: Madonna, LMFAO,[30] Cirque du Soleil,[31] Nicki Minaj,[32] M.I.A.,[33] Cee Lo Green,[30] Andy Lewis,[34] Avon High School Drumline, Center Grove High School Drumline, Fishers High School Drumline, Franklin Central High School Drumline, Southern University Dancing Dolls, 200 Person Choir consisting of Indianapolis locals
Producer: Ricky Kirshner
Sponsor: Bridgestone
Setlist:[30]

"Vogue" (Madonna)
"Music" / "Party Rock Anthem" / "Sexy and I Know It" (Madonna with LMFAO)
"Give Me All Your Luvin'" (Madonna with Nicki Minaj and M.I.A.)
"Open Your Heart" / "Express Yourself" (Madonna with Cee Lo Green)
"Like a Prayer" (Madonna with Cee Lo Green)

XLVII

Main article: Super Bowl XLVII halftime show

Date: Feb 3, 2013
Location: Mercedes-Benz Superdome (New Orleans, Louisiana)
Performers: Beyoncé, Destiny's Child
Producer: Ricky Kirshner[35]
Director: Hamish Hamilton[35]
Sponsor: Pepsi
References:[36]
Setlist:

"Run The World (Girls)" (Intro) / Vince Lombardi "Excellence" speech voiceover
"Love on Top" (chorus a cappella) (Beyoncé)
"Crazy in Love" (Beyoncé)
"End of Time" (Beyoncé)
"Baby Boy" (Beyoncé)
"Bootylicious" (Destiny's Child)
"Independent Women Part I" (Destiny's Child)
"Single Ladies (Put a Ring on It)" (Beyoncé featuring Kelly Rowland and Michelle Williams)
"Halo" (Beyoncé)

XLVIII

Main article: Super Bowl XLVIII halftime show

Date: Feb 2, 2014
Location: MetLife Stadium (East Rutherford, New Jersey)
Performers: Bruno Mars, Red Hot Chili Peppers
Producer: Ricky Kirshner
Director: Hamish Hamilton
Sponsor: Pepsi
References:[37]
Setlist:

"Billionaire" (Intro) (children's choir)
"Locked Out of Heaven" (Bruno Mars)
"Treasure" (Bruno Mars)
"Runaway Baby" (Bruno Mars)
"Give It Away" (Red Hot Chili Peppers with Bruno Mars)
"Just the Way You Are" (Bruno Mars)

XLIX

Main article: Super Bowl XLIX halftime show

Date: Feb 1, 2015
Location: University of Phoenix Stadium (Glendale, Arizona)
Performers: Katy Perry, Lenny Kravitz, Missy Elliott, and Arizona State University Sun Devil Marching Band
Producer: Ricky Kirshner
Director: Hamish Hamilton
Sponsor: Pepsi
References:[38][39][40]
Setlist:

"Roar" (Katy Perry)
"Dark Horse" (Katy Perry)
"I Kissed a Girl" (Lenny Kravitz and Katy Perry)
"Teenage Dream" (Katy Perry)
"California Gurls" (Katy Perry)
"Get Ur Freak On" (Missy Elliott and Katy Perry)
"Work It" (Missy Elliott and Katy Perry)
"Lose Control" (Missy Elliott)
"Firework" (Katy Perry)

50

Main article: Super Bowl 50 halftime show

Date: Feb 7, 2016
Location: Levi's Stadium (Santa Clara, California)
Performers: Coldplay, Beyoncé, Bruno Mars, Mark Ronson, Gustavo Dudamel, University of California Marching Band and Youth Orchestra L.A.
Producer: Ricky Kirshner
Director: Hamish Hamilton
Sponsor: Pepsi
References:[41][42][43][44][45]
Setlist:[46]

"Yellow" (intro a cappella) (Coldplay)
"Viva la Vida" (Coldplay)
"Paradise" (Coldplay)
"Adventure of a Lifetime" (Coldplay)
"Uptown Funk" (Mark Ronson & Bruno Mars)
"Formation" (Beyoncé)
"Crazy In Love"/"Uptown Funk" (Beyoncé, Bruno Mars)
"Clocks" (instrumental) (Coldplay)
"Fix You"/"Up & Up" (Coldplay, Beyoncé and Bruno Mars)

LI

Main article: Super Bowl LI halftime show

Date: Feb 5, 2017
Location: NRG Stadium (Houston, Texas)
Performer: Lady Gaga
Producer: Ricky Kirshner
Director: Hamish Hamilton
Sponsor: Pepsi Zero Sugar
References:[47][48]
Setlist:

"God Bless America"/"This Land Is Your Land"
"Poker Face"
"Born This Way"
"Telephone"
"Just Dance"
"Million Reasons"
"Bad Romance"

LII

Main article: Super Bowl LII halftime show

Date: Feb 4, 2018
Location: U.S. Bank Stadium (Minneapolis, Minnesota)
Performer: Justin Timberlake and the Tennessee Kids, University of Minnesota Marching Band
Producer: Ricky Kirshner
Director: Hamish Hamilton
Sponsor: Pepsi
References: [49][50][51][52][53]
Setlist:

"Filthy"
"Rock Your Body"
"Señorita"
"SexyBack"
"My Love"
"Cry Me a River"
"Suit & Tie" (Featuring the University of Minnesota Marching Band)
"Until the End of Time"
"I Would Die 4 U" (Pre-recorded video of Prince (displayed on a projection screen) with Justin Timberlake)
"Mirrors"
"Can't Stop the Feeling!"

text: Details on specific shows[edit]

text: Super Bowl XXXVI[edit]

text: U2 performed 3 songs: "Beautiful Day," "MLK," and "Where the Streets Have No Name." During the beginning of "MLK" and continuing until the end of "Where The Streets Have No Name," a large banner behind the band displayed the names of all the people who lost their lives on the September 11 attacks. Bono ended the song by opening up his jacket, the inside of which displayed the American flag.

text: Super Bowl XL[edit]

text: For The Rolling Stones, the stage was in the form of the group's iconic tongue logo (John Pasche's "Cunning Linguist" first used in 1971 on their Sticky Fingers album). It was the largest stage ever assembled for a Super Bowl halftime show, with 28 separate pieces assembled in five minutes by a 600-member volunteer stage crew. The group performed three songs: "Start Me Up," "Rough Justice," and "(I Can't Get No) Satisfaction." The show was viewed by 89.9 million people, more than the audiences for the Oscars, Grammys and Emmy Awards combined.[54] In the wake of the Super Bowl XXXVIII halftime show controversy with Janet Jackson and Justin Timberlake, ABC and the NFL imposed a five-second delay and censored lyrics considered too sexually explicit in the first two songs by briefly turning off Mick Jagger's microphone—censoring to which the group had previously agreed.[55] However, the choice of The Rolling Stones sparked controversy in the Detroit community because the band did not represent the traditional Detroit "Motown Sound," and no artists from the area were included.[56]


document_title: Epithelium

question_text: what type of epithelial tissue lines the mouth

text: Epithelium

text: Classification[edit]

text: In general, epithelial tissues are classified by the number of their layers and by the shape and function of the cells.[1][3][4]

text: The three principal shapes associated with epithelial cells are—squamous, cuboidal and columnar.

text:
Squamous epithelium has cells that are wider than their height (flat and scale-like).
Cuboidal epithelium has cells whose height and width are approximately the same (cube shaped).
Columnar epithelium has cells taller than they are wide (column-shaped).

tag: ul

text: By layer, epithelium is classed as either simple epithelium, only one cell thick (unilayered) or stratified epithelium as stratified squamous epithelium, stratified cuboidal epithelium, and stratified columnar epithelium that are two or more cells thick (multi-layered),[5][6] and both types of layering can be made up of any of the cell shapes.[3] However, when taller simple columnar epithelial cells are viewed in cross section showing several nuclei appearing at different heights, they can be confused with stratified epithelia. This kind of epithelium is therefore described as pseudostratified columnar epithelium.[7]

text: Transitional epithelium has cells that can change from squamous to cuboidal, depending on the amount of tension on the epithelium.[8]

text: Simple epithelium[edit]

text: Simple epithelium is a single layer of cells with every cell in direct contact with the basement membrane that separates it from the underlying connective tissue. In general, it is found where absorption and filtration occur. The thinness of the epithelial barrier facilitates these processes.[3]

text: In general, simple epithelial tissues are classified by the shape of their cells. The four major classes of simple epithelium are: (1) simple squamous; (2) simple cuboidal; (3) simple columnar; (4) pseudostratified.[3]

text: Stratified epithelium[edit]

text: Stratified epithelium differs from simple epithelium in that it is multilayered. It is therefore found where body linings have to withstand mechanical or chemical insult such that layers can be abraded and lost without exposing subepithelial layers. Cells flatten as the layers become more apical, though in their most basal layers the cells can be squamous, cuboidal or columnar.[9]

text: Stratified epithelia (of columnar, cuboidal or squamous type) can have the following specializations:[9]

text:
Specialization
Description

Keratinized
In this particular case, the most apical layers (exterior) of cells are dead and lose their nucleus and cytoplasm, instead contain a tough, resistant protein called keratin. This specialization makes the epithelium waterproof, so is found in the mammalian skin. The lining of the esophagus is an example of a non-keratinized or "moist" stratified epithelium.[9]

Parakeratinized
In this case, the most apical layers of cells are filled with keratin, but they still retain their nuclei. These nuclei are pyknotic, meaning that they are highly condensed. Parakeratinized epithelium is sometimes found in the oral mucosa and in the upper regions of the esophagus.[10]

Transitional
Transitional epithelia are found in tissues that stretch and it can appear to be stratified cuboidal when the tissue is not stretched or stratified squamous when the organ is distended and the tissue stretches. It is sometimes called urothelium since it is almost exclusively found in the bladder, ureters and urethra.[9]

text: Cell types[edit]

text: The basic cell types are squamous, cuboidal, and columnar classed by their shape.

text:
Type
Description

Squamous
Squamous cells have the appearance of thin, flat plates that can look polygonal when viewed from above.[11] Their name comes from squāma, Latin for scale – as on fish or snake skin. The cells fit closely together in tissues; providing a smooth, low-friction surface over which fluids can move easily. The shape of the nucleus usually corresponds to the cell form and helps to identify the type of epithelium. Squamous cells tend to have horizontally flattened, nearly oval shaped nuclei because of the thin flattened form of the cell. Squamous epitheliium is found lining surfaces such as the skin, and alveoli in the lung, enabling simple passive diffusion as also found in the alveolar epithelium in the lungs. Specialized squamous epithelium also forms the lining of cavities such as in blood vessels, as endothelium and in the pericardium, as mesothelium and in other body cavities.

Cuboidal
Cuboidal epithelial cells have a cube-like shape and appear square in cross-section. The cell nucleus is large, spherical and is in the centre of the cell. Cuboidal epithelium is commonly found in secretive tissue such as the exocrine glands, or in absorptive tissue such as the pancreas, the lining of the kidney tubules as well as in the ducts of the glands. The germinal epithelium that covers the female ovary, and the germinal epithelium that lines the walls of the seminferous tubules in the testes are also of the cuboidal type. Cuboidal cells provide protection and may be active in pumping material in or out of the lumen, or passive depending on their location and specialisation. Simple cuboidal epithelium commonly differentiates to form the secretory and duct portions of glands.[12] Stratified cuboidal epithelium protects areas such as the ducts of sweat glands,[13] mammary glands, and salivary glands.

Columnar
Columnar epithelial cells are elongated and column-shaped and have a height of at least four times their width. Their nuclei are elongated and are usually located near the base of the cells. Columnar epithelium forms the lining of the stomach and intestines. The cells here may possess microvilli for maximising the surface area for absorption and these microvilli may form a brush border. Other cells may be ciliated to move mucus in the function of mucociliary clearance. Other ciliated cells are found in the fallopian tubes, the uterus and central canal of the spinal cord. Some columnar cells are specialized for sensory reception such as in the nose, ears and the taste buds. Hair cells in the inner ears have stereocilia which are similar to microvilli. Goblet cells are modified columnar cells and are found between the columnar epithelial cells of the duodenum. They secrete mucus, which acts as a lubricant. Single-layered non-ciliated columnar epithelium tends to indicate an absorptive function. Stratified columnar epithelium is rare but is found in lobar ducts in the salivary glands, the eye, pharynx and sex organs. This consists of a layer of cells resting on at least one other layer of epithelial cells which can be squamous, cuboidal, or columnar.

Pseudostratified
These are simple columnar epithelial cells whose nuclei appear at different heights, giving the misleading (hence "pseudo") impression that the epithelium is stratified when the cells are viewed in cross section. Ciliated pseudostratified epithelial cells have cilia. Cilia are capable of energy dependent pulsatile beating in a certain direction through interaction of cytoskeletal microtubules and connecting structural proteins and enzymes. In the respiratory tract the wafting effect produced causes mucus secreted locally by the goblet cells (to lubricate and to trap pathogens and particles) to flow in that direction (typically out of the body). Ciliated epithelium is found in the airways (nose, bronchi), but is also found in the uterus and Fallopian tubes, where the cilia propel the ovum to the uterus.

text: Structure[edit]

text: Cells of epithelial tissue are tightly packed and form a continuous sheet. They have almost no intercellular spaces. All epithelia is usually separated from underlying tissues by an extracellular fibrous basement membrane. The lining of the mouth, lung alveoli and kidney tubules all are made of epithelial tissue. The lining of the blood and lymphatic vessels are of a specialised form of epithelium called endothelium.

text: Location[edit]

text: Epithelium lines both the outside (skin) and the inside cavities and lumina of bodies. The outermost layer of human skin is composed of dead stratified squamous, keratinized epithelial cells.[14]

text: Tissues that line the inside of the mouth, the oesophagus, the vagina, and part of the rectum are composed of nonkeratinized stratified squamous epithelium. Other surfaces that separate body cavities from the outside environment are lined by simple squamous, columnar, or pseudostratified epithelial cells. Other epithelial cells line the insides of the lungs, the gastrointestinal tract, the reproductive and urinary tracts, and make up the exocrine and endocrine glands. The outer surface of the cornea is covered with fast-growing, easily regenerated epithelial cells. A specialised form of epithelium – endothelium forms the inner lining of blood vessels and the heart, and is known as vascular endothelium, and lining lymphatic vessels as lymphatic endothelium. Another type, mesothelium, forms the walls of the pericardium, pleurae, and peritoneum.[citation needed]

text: In arthropods, the integument, or external "skin", consists of a single layer of epithelial ectoderm from which arises the cuticle,[15] an outer covering of chitin the rigidity of which varies as per its chemical composition.

text: Basement membrane[edit]

text: Epithelial tissue rests on a basement membrane, which acts as a scaffolding on which epithelium can grow and regenerate after injuries.[16] Epithelial tissue has a nerve supply, but no blood supply and must be nourished by substances diffusing from the blood vessels in the underlying tissue. The basement membrane acts as a selectively permeable membrane that determines which substances will be able to enter the epithelium.[2]

text: Cell junctions[edit]

text: Cell junctions are especially abundant in epithelial tissues. They consist of protein complexes and provide contact between neighbouring cells, between a cell and the extracellular matrix, or they build up the paracellular barrier of epithelia and control the paracellular transport.[17]

text: Cell junctions are the contact points between plasma membrane and tissue cells. There are mainly 5 different types of cell junctions: tight junctions, adherens junctions, desmosomes, hemidesmosomes, and gap junctions. Tight junctions are a pair of trans-membrane protein fused on outer plasma membrane. Adherens junctions are a plaque (protein layer on the inside plasma membrane) which attaches both cells' microfilaments. Desmosomes attach to the microfilaments of cytoskeleton made up of keratin protein. Hemidesmosomes resemble desmosomes on a section. They are made up of the integrin (a transmembrane protein) instead of cadherin. They attach the epithelial cell to the basement membrane. Gap junctions connect the cytoplasm of two cells and are made up of proteins called connexins (six of which come together to make a connexion).[citation needed]

text: Development[edit]

text: Epithelial tissues are derived from all of the embryological germ layers:[citation needed]

text:
from ectoderm (e.g., the epidermis);
from endoderm (e.g., the lining of the gastrointestinal tract);
from mesoderm (e.g., the inner linings of body cavities).

text: However, it is important to note that pathologists do not consider endothelium and mesothelium (both derived from mesoderm) to be true epithelium. This is because such tissues present very different pathology. For that reason, pathologists label cancers in endothelium and mesothelium sarcomas, whereas true epithelial cancers are called carcinomas. Also, the filaments that support these mesoderm-derived tissues are very distinct. Outside of the field of pathology, it is, in general, accepted that the epithelium arises from all three germ layers.[citation needed]

text: Functions[edit]

text: Epithelial tissues have as their primary functions:

text:
to protect the tissues that lie beneath from radiation, desiccation, toxins, invasion by pathogens, and physical trauma
the regulation and exchange of chemicals between the underlying tissues and a body cavity
the secretion of hormones into the circulatory system, as well as the secretion of sweat, mucus, enzymes, and other products that are delivered by ducts[18]
to provide sensation[19]

tag: ol

text: Glandular tissue[edit]

text: Glandular tissue is the type of epithelium that forms the glands from the infolding of epithelium and subsequent growth in the underlying connective tissue. There are two major classifications of glands: endocrine glands and exocrine glands:

text:
Endocrine glands secrete their product into the extracellular space where it is rapidly taken up by the circulatory system.
Exocrine glands secrete their products into a duct that then delivers the product to the lumen of an organ or onto the free surface of the epithelium.

text: Sensing the extracellular environment[edit]

text: "Some epithelial cells are ciliated, especially in respiratory epithelium, and they commonly exist as a sheet of polarised cells forming a tube or tubule with cilia projecting into the lumen." Primary cilia on epithelial cells provide chemosensation, thermoception, and mechanosensation of the extracellular environment by playing "a sensory role mediating specific signalling cues, including soluble factors in the external cell environment, a secretory role in which a soluble protein is released to have an effect downstream of the fluid flow, and mediation of fluid flow if the cilia are motile."[20]

text: Clinical significance[edit]

text: The slide shows at (1) an epithelial cell infected by Chlamydia pneumonia; their inclusion bodies shown at (3); an uninfected cell shown at (2) and (4) showing the difference between an infected cell nucleus and an uninfected cell nucleus.

text: Epithelium grown in culture can be identified by examining its morphological characteristics. Epithelial cells tend to cluster together, and have a "characteristic tight pavement-like appearance". But this is not always the case, such as when the cells are derived from a tumor. In these cases, it is often necessary to use certain biochemical markers to make a positive identification. The intermediate filament proteins in the cytokeratin group are almost exclusively found in epithelial cells, and so are often used for this purpose.[21]

text: Carcinomas develop in epithelial tissues. Sarcomas develop in connective tissue.[22]

text: When epithelial cells or tissues are damaged from cystic fibrosis, sweat glands are also damaged, causing a frosty coating of the skin.

text: Etymology and pronunciation[edit]

text: The word epithelium (/ˌɛpɪˈθiːliəm/) uses the Greek roots ἐπί (epi), "on" or "upon", and θηλή (thēlē), "nipple". Epithelium is so called because the name was originally used to describe the translucent covering of small "nipples" of tissue on the lip.[23] The word has both mass and count senses; the plural form is epithelia.

text: Additional images[edit]

text:
Squamous Epithelium 100x

Human cheek cells (Nonkeratinized stratified squamous epithelium) 500x

Histology of female urethra showing transitional epithelium

Histology of sweat gland showing stratified cuboidal epithelium


document_title: Geologic time scale

question_text: what unit of geologic time is the greatest span of time

text: Geologic time scale

text: Terminology[edit]

text: The primary defined divisions of time are eons, in sequence the Hadean, the Archean, the Proterozoic and the Phanerozoic. The first three of these can be referred to collectively as the Precambrian supereon. Eons are divided into eras, which are in turn divided into periods, epochs and ages.

text: The following four timelines show the geologic time scale. The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon. Therefore, the second timeline shows an expanded view of the most recent eon. In a similar way, the most recent era is expanded in the third timeline, and the most recent period is expanded in the fourth timeline.

text: Corresponding to eons, eras, periods, epochs and ages, the terms "eonothem", "erathem", "system", "series", "stage" are used to refer to the layers of rock that belong to these stretches of geologic time in Earth's history.

text: Geologists qualify these units as "early", "mid", and "late" when referring to time, and "lower", "middle", and "upper" when referring to the corresponding rocks. For example, the lower Jurassic Series in chronostratigraphy corresponds to the early Jurassic Epoch in geochronology.[2] The adjectives are capitalized when the subdivision is formally recognized, and lower case when not; thus "early Miocene" but "Early Jurassic."

text: Rationale[edit]

text: Evidence from radiometric dating indicates that Earth is about 4.54 billion years old.[3][4] The geology or deep time of Earth's past has been organized into various units according to events which took place. Different spans of time on the GTS are usually marked by corresponding changes in the composition of strata which indicate major geological or paleontological events, such as mass extinctions. For example, the boundary between the Cretaceous period and the Paleogene period is defined by the Cretaceous–Paleogene extinction event, which marked the demise of the non-avian dinosaurs and many other groups of life. Older time spans, which predate the reliable fossil record (before the Proterozoic eon), are defined by their absolute age.

text: Geologic units from the same time but different parts of the world often look different and contain different fossils, so the same time-span was historically given different names in different locales. For example, in North America, the Lower Cambrian is called the Waucoban series that is then subdivided into zones based on succession of trilobites. In East Asia and Siberia, the same unit is split into Alexian, Atdabanian, and Botomian stages. A key aspect of the work of the International Commission on Stratigraphy is to reconcile this conflicting terminology and define universal horizons that can be used around the world.[5]

text: Some other planets and moons in the Solar System have sufficiently rigid structures to have preserved records of their own histories, for example, Venus, Mars and the Earth's Moon. Dominantly fluid planets, such as the gas giants, do not preserve their history in a comparable manner. Apart from the Late Heavy Bombardment, events on other planets probably had little direct influence on the Earth, and events on Earth had correspondingly little effect on those planets. Construction of a time scale that links the planets is, therefore, of only limited relevance to the Earth's time scale, except in a Solar System context. The existence, timing, and terrestrial effects of the Late Heavy Bombardment is still debated.[a]

text: History and nomenclature of the time scale[edit]

text: Early history[edit]

text: In Ancient Greece, Aristotle (384-322 BCE) observed that fossils of seashells in rocks resembled those found on beaches – he inferred that the fossils in rocks were formed by living animals, and he reasoned that the positions of land and sea had changed over long periods of time. Leonardo da Vinci (1452–1519) concurred with Aristotle's interpretation that fossils represented the remains of ancient life.[6]

text: The 11th-century Persian geologist Avicenna (Ibn Sina, died 1037) and the 13th-century Dominican bishop Albertus Magnus (died 1280) extended Aristotle's explanation into a theory of a petrifying fluid.[7] Avicenna also first proposed one of the principles underlying geologic time scales, the law of superposition of strata, while discussing the origins of mountains in The Book of Healing (1027).[8][9] The Chinese naturalist Shen Kuo (1031–1095) also recognized the concept of "deep time".[10]

text: Establishment of primary principles[edit]

text: In the late 17th century Nicholas Steno (1638–1686) pronounced the principles underlying geologic (geological) time scales. Steno argued that rock layers (or strata) were laid down in succession, and that each represents a "slice" of time. He also formulated the law of superposition, which states that any given stratum is probably older than those above it and younger than those below it. While Steno's principles were simple, applying them proved challenging. Over the course of the 18th century geologists realized that:

text:
Sequences of strata often become eroded, distorted, tilted, or even inverted after deposition
Strata laid down at the same time in different areas could have entirely different appearances
The strata of any given area represented only part of Earth's long history

text: The Neptunist theories popular at this time (expounded by Abraham Werner (1749–1817) in the late 18th century) proposed that all rocks had precipitated out of a single enormous flood. A major shift in thinking came when James Hutton presented his Theory of the Earth; or, an Investigation of the Laws Observable in the Composition, Dissolution, and Restoration of Land Upon the Globe[11] before the Royal Society of Edinburgh in March and April 1785. It has been said[by whom?] that "as things appear from the perspective of the 20th century, James Hutton in those readings became the founder of modern geology".[12]:95-100 Hutton proposed that the interior of Earth was hot, and that this heat was the engine which drove the creation of new rock: land was eroded by air and water and deposited as layers in the sea; heat then consolidated the sediment into stone, and uplifted it into new lands. This theory, known as "Plutonism", stood in contrast to the "Neptunist" flood-oriented theory.

text: Formulation of geologic time scale[edit]

text: The first serious attempts to formulate a geologic time scale that could be applied anywhere on Earth were made in the late 18th century. The most influential of those early attempts (championed by Werner, among others) divided the rocks of Earth's crust into four types: Primary, Secondary, Tertiary, and Quaternary. Each type of rock, according to the theory, formed during a specific period in Earth history. It was thus possible to speak of a "Tertiary Period" as well as of "Tertiary Rocks." Indeed, "Tertiary" (now Paleogene and Neogene) remained in use as the name of a geological period well into the 20th century and "Quaternary" remains in formal use as the name of the current period.

text: The identification of strata by the fossils they contained, pioneered by William Smith, Georges Cuvier, Jean d'Omalius d'Halloy, and Alexandre Brongniart in the early 19th century, enabled geologists to divide Earth history more precisely. It also enabled them to correlate strata across national (or even continental) boundaries. If two strata (however distant in space or different in composition) contained the same fossils, chances were good that they had been laid down at the same time. Detailed studies between 1820 and 1850 of the strata and fossils of Europe produced the sequence of geologic periods still used today.

text: Naming of geologic periods, eras and epochs[edit]

text: Early work on developing the geologic time scale was dominated by British geologists, and the names of the geologic periods reflect that dominance. The "Cambrian", (the classical name for Wales) and the "Ordovician", and "Silurian", named after ancient Welsh tribes, were periods defined using stratigraphic sequences from Wales.[12]:113–114 The "Devonian" was named for the English county of Devon, and the name "Carboniferous" was an adaptation of "the Coal Measures", the old British geologists’ term for the same set of strata. The "Permian" was named after Perm, Russia, because it was defined using strata in that region by Scottish geologist Roderick Murchison. However, some periods were defined by geologists from other countries. The "Triassic" was named in 1834 by a German geologist Friedrich Von Alberti from the three distinct layers (Latin trias meaning triad)—red beds, capped by chalk, followed by black shales—that are found throughout Germany and Northwest Europe, called the ‘Trias’. The "Jurassic" was named by a French geologist Alexandre Brongniart for the extensive marine limestone exposures of the Jura Mountains. The "Cretaceous" (from Latin creta meaning ‘chalk’) as a separate period was first defined by Belgian geologist Jean d'Omalius d'Halloy in 1822, using strata in the Paris basin[13] and named for the extensive beds of chalk (calcium carbonate deposited by the shells of marine invertebrates) found in Western Europe.

text: British geologists were also responsible for the grouping of periods into eras and the subdivision of the Tertiary and Quaternary periods into epochs. In 1841 John Phillips published the first global geologic time scale based on the types of fossils found in each era. Phillips’ scale helped standardize the use of terms like Paleozoic ("old life") which he extended to cover a larger period than it had in previous usage, and Mesozoic ("middle life") which he invented.[14]

text: Dating of time scales[edit]

text: When William Smith and Sir Charles Lyell first recognized that rock strata represented successive time periods, time scales could be estimated only very imprecisely since estimates of rates of change were uncertain. While creationists had been proposing dates of around six or seven thousand years for the age of Earth based on the Bible, early geologists were suggesting millions of years for geologic periods, and some were even suggesting a virtually infinite age for Earth.[citation needed] Geologists and paleontologists constructed the geologic table based on the relative positions of different strata and fossils, and estimated the time scales based on studying rates of various kinds of weathering, erosion, sedimentation, and lithification. Until the discovery of radioactivity in 1896 and the development of its geological applications through radiometric dating during the first half of the 20th century, the ages of various rock strata and the age of Earth were the subject of considerable debate.

text: The first geologic time scale that included absolute dates was published in 1913 by the British geologist Arthur Holmes.[15] He greatly furthered the newly created discipline of geochronology and published the world-renowned book The Age of the Earth in which he estimated Earth's age to be at least 1.6 billion years.[16]

text: In 1977, the Global Commission on Stratigraphy (now the International Commission on Stratigraphy) began to define global references known as GSSP (Global Boundary Stratotype Sections and Points) for geologic periods and faunal stages. The commission's most recent work is described in the 2004 geologic time scale of Gradstein et al.[17] A UML model for how the timescale is structured, relating it to the GSSP, is also available.[18][19]

text: The Anthropocene[edit]

text: The term "Anthropocene" is used informally by popular culture and a growing number of scientists to describe the current epoch in which we are living. The term was coined by Paul Crutzen and Eugene Stoermer in 2000 to describe the current time, in which humans have had an enormous impact on the environment. It has evolved to describe an "epoch" starting some time in the past and on the whole defined by anthropogenic carbon emissions and production and consumption of plastic goods that are left in the ground.[20]

text: Critics of this term say that the term should not be used because it is difficult, if not nearly impossible, to define a specific time when humans started influencing the rock strata—defining the start of an epoch.[21] Others say that humans have not even started to leave their biggest impact on Earth, and therefore the Anthropocene has not even started yet. Whatever the case, the ICS has not officially approved the term, as of September 2015[update].[22]

text: Table of geologic time[edit]

text: The following table summarizes the major events and characteristics of the periods of time making up the geologic time scale. This table is arranged with the most recent geologic periods at the top, and the most ancient at the bottom. The height of each table entry does not correspond to the duration of each subdivision of time.

text: The content of the table is based on the current official geologic time scale of the International Commission on Stratigraphy,[1] with the epoch names altered to the early/late format from lower/upper as recommended by the ICS when dealing with chronostratigraphy.[2]

text: A service providing a Resource Description Framework/Web Ontology Language representation of the timescale is available through the Commission for the Management and Application of Geoscience Information GeoSciML project as a service[23] and at a SPARQL end-point.[24][25]

text:
[hide]Supereon
Eon
Era
Period[b]
Epoch
Age[c]
Major events
Start, million years ago[c]

n/a[d]
Phanerozoic
Cenozoic[e]
Quaternary
Holocene

chrons: Subatlantic · Subboreal · Atlantic · Boreal · Preboreal

Quaternary Ice Age recedes, and the current interglacial begins. Sahara forms from savannah. Rise of human civilization, beginning of agriculture. Stone Age cultures give way to Bronze Age (3300 BC) and Iron Age (1200 BC), giving rise to many pre-historic cultures throughout the world. Little Ice Age (stadial) causes brief cooling in Northern Hemisphere from 1400 to 1850. Following the Industrial Revolution, atmospheric CO2 levels rise from around 280 parts per million volume (ppmv) to the current level of 400[28] ppmv.[29][f]
0.0117[g]

Pleistocene
Late (locally Tarantian · Tyrrhenian · Eemian · Sangamonian)
Flourishing and then extinction of Pleistocene megafauna. Evolution of anatomically modern humans. Quaternary Ice Age continues with glaciations and interstadials (and the accompanying fluctuations from 100 to 300 ppmv in atmospheric CO2 levels[29][f]), further intensification of Icehouse Earth conditions, roughly 1.6 Ma. Last glacial maximum (30000 years ago), last glacial period (18000–15000 years ago). Dawn of human stone-age cultures, with increasing technical complexity relative to previous ice age cultures, such as engravings and clay statues (e.g. Venus of Lespugue), particularly in the Mediterranean and Europe. Lake Toba supervolcano erupts 75000 years before present, causing a volcanic winter that possibly pushes humanity to the brink of extinction. Pleistocene ends with Oldest Dryas, Older Dryas/Allerød and Younger Dryas climate events, with Younger Dryas forming the boundary with the Holocene.
0.126

Middle (formerly Ionian)
0.781

Calabrian
1.8*

Gelasian
2.58*

Neogene
Pliocene
Piacenzian
Intensification of present Icehouse conditions, present (Quaternary) ice age begins roughly 2.58 Ma; cool and dry climate. Australopithecines, many of the existing genera of mammals, and recent mollusks appear. Homo habilis appears.
3.6*

Zanclean
5.333*

Miocene
Messinian
Moderate Icehouse climate, punctuated by ice ages; Orogeny in Northern Hemisphere. Modern mammal and bird families become recognizable. Horses and mastodons diverse. Grasses become ubiquitous. First apes appear (for reference see the article: "Sahelanthropus tchadensis"). Kaikoura Orogeny forms Southern Alps in New Zealand, continues today. Orogeny of the Alps in Europe slows, but continues to this day. Carpathian orogeny forms Carpathian Mountains in Central and Eastern Europe. Hellenic orogeny in Greece and Aegean Sea slows, but continues to this day. Middle Miocene Disruption occurs. Widespread forests slowly draw in massive amounts of CO2, gradually lowering the level of atmospheric CO2 from 650 ppmv down to around 100 ppmv.[29][f]
7.246*

Tortonian
11.63*

Serravallian
13.82*

Langhian
15.97

Burdigalian
20.44

Aquitanian
23.03*

Paleogene
Oligocene
Chattian
Warm but cooling climate, moving towards Icehouse; Rapid evolution and diversification of fauna, especially mammals. Major evolution and dispersal of modern types of flowering plants
28.1

Rupelian
33.9*

Eocene
Priabonian
Moderate, cooling climate. Archaic mammals (e.g. Creodonts, Condylarths, Uintatheres, etc.) flourish and continue to develop during the epoch. Appearance of several "modern" mammal families. Primitive whales diversify. First grasses. Reglaciation of Antarctica and formation of its ice cap; Azolla event triggers ice age, and the Icehouse Earth climate that would follow it to this day, from the settlement and decay of seafloor algae drawing in massive amounts of atmospheric carbon dioxide,[29][f] lowering it from 3800 ppmv down to 650 ppmv. End of Laramide and Sevier Orogenies of the Rocky Mountains in North America. Orogeny of the Alps in Europe begins. Hellenic Orogeny begins in Greece and Aegean Sea.
37.8

Bartonian
41.2

Lutetian
47.8*

Ypresian
56*

Paleocene
Thanetian
Climate tropical. Modern plants appear; Mammals diversify into a number of primitive lineages following the extinction of the dinosaurs. First large mammals (up to bear or small hippo size). Alpine orogeny in Europe and Asia begins. Indian Subcontinent collides with Asia 55 Ma, Himalayan Orogeny starts between 52 and 48 Ma.
59.2*

Selandian
61.6*

Danian
66*

Mesozoic
Cretaceous
Late
Maastrichtian
Flowering plants proliferate, along with new types of insects. More modern teleost fish begin to appear. Ammonoidea, belemnites, rudist bivalves, echinoids and sponges all common. Many new types of dinosaurs (e.g. Tyrannosaurs, Titanosaurs, duck bills, and horned dinosaurs) evolve on land, as do Eusuchia (modern crocodilians); and mosasaurs and modern sharks appear in the sea. Primitive birds gradually replace pterosaurs. Monotremes, marsupials and placental mammals appear. Break up of Gondwana. Beginning of Laramide and Sevier Orogenies of the Rocky Mountains. atmospheric CO2 close to present-day levels.
72.1 ± 0.2*

Campanian
83.6 ± 0.2

Santonian
86.3 ± 0.5*

Coniacian
89.8 ± 0.3

Turonian
93.9*

Cenomanian
100.5*

Early
Albian
~113

Aptian
~125

Barremian
~129.4

Hauterivian
~132.9

Valanginian
~139.8

Berriasian
~145

Jurassic
Late
Tithonian
Gymnosperms (especially conifers, Bennettitales and cycads) and ferns common. Many types of dinosaurs, such as sauropods, carnosaurs, and stegosaurs. Mammals common but small. First birds and lizards. Ichthyosaurs and plesiosaurs diverse. Bivalves, Ammonites and belemnites abundant. Sea urchins very common, along with crinoids, starfish, sponges, and terebratulid and rhynchonellid brachiopods. Breakup of Pangaea into Gondwana and Laurasia. Nevadan orogeny in North America. Rangitata and Cimmerian orogenies taper off. Atmospheric CO2 levels 3–4 times the present day levels (1200–1500 ppmv, compared to today's 400 ppmv[29][f]).
152.1 ± 0.9

Kimmeridgian
157.3 ± 1.0

Oxfordian
163.5 ± 1.0

Middle
Callovian
166.1 ± 1.2

Bathonian
168.3 ± 1.3*

Bajocian
170.3 ± 1.4*

Aalenian
174.1 ± 1.0*

Early
Toarcian
182.7 ± 0.7*

Pliensbachian
190.8 ± 1.0*

Sinemurian
199.3 ± 0.3*

Hettangian
201.3 ± 0.2*

Triassic
Late
Rhaetian
Archosaurs dominant on land as dinosaurs, in the oceans as Ichthyosaurs and nothosaurs, and in the air as pterosaurs. Cynodonts become smaller and more mammal-like, while first mammals and crocodilia appear. Dicroidiumflora common on land. Many large aquatic temnospondyl amphibians. Ceratitic ammonoids extremely common. Modern corals and teleost fish appear, as do many modern insect clades. Andean Orogeny in South America. Cimmerian Orogeny in Asia. Rangitata Orogeny begins in New Zealand. Hunter-Bowen Orogeny in Northern Australia, Queensland and New South Wales ends, (c. 260–225 Ma)
~208.5

Norian
~227

Carnian
~237*

Middle
Ladinian
~242*

Anisian
247.2

Early
Olenekian
251.2

Induan
251.902 ± 0.06*

Paleozoic
Permian
Lopingian
Changhsingian
Landmasses unite into supercontinent Pangaea, creating the Appalachians. End of Permo-Carboniferous glaciation. Synapsid reptiles (pelycosaurs and therapsids) become plentiful, while parareptiles and temnospondyl amphibians remain common. In the mid-Permian, coal-age flora are replaced by cone-bearing gymnosperms (the first true seed plants) and by the first true mosses. Beetles and flies evolve. Marine life flourishes in warm shallow reefs; productid and spiriferid brachiopods, bivalves, forams, and ammonoids all abundant. Permian-Triassic extinction event occurs 251 Ma: 95% of life on Earth becomes extinct, including all trilobites, graptolites, and blastoids. Ouachita and Innuitian orogenies in North America. Uralian orogeny in Europe/Asia tapers off. Altaid orogeny in Asia. Hunter-Bowen Orogeny on Australian continent begins (c. 260–225 Ma), forming the MacDonnell Ranges.
254.14 ± 0.07*

Wuchiapingian
259.1 ± 0.4*

Guadalupian
Capitanian
265.1 ± 0.4*

Wordian
268.8 ± 0.5*

Roadian
272.95 ± 0.5*

Cisuralian
Kungurian
283.5 ± 0.6

Artinskian
290.1 ± 0.26

Sakmarian
295 ± 0.18

Asselian
298.9 ± 0.15*

Carbon-
iferous[h]
Pennsylvanian
Gzhelian
Winged insects radiate suddenly; some (esp. Protodonata and Palaeodictyoptera) are quite large. Amphibians common and diverse. First reptiles and coal forests (scale trees, ferns, club trees, giant horsetails, Cordaites, etc.). Highest-ever atmospheric oxygen levels. Goniatites, brachiopods, bryozoa, bivalves, and corals plentiful in the seas and oceans. Testate forams proliferate. Uralian orogeny in Europe and Asia. Variscan orogeny occurs towards middle and late Mississippian Periods.
303.7 ± 0.1

Kasimovian
307 ± 0.1

Moscovian
315.2 ± 0.2

Bashkirian
323.2 ± 0.4*

Mississippian
Serpukhovian
Large primitive trees, first land vertebrates, and amphibious sea-scorpions live amid coal-forming coastal swamps. Lobe-finned rhizodonts are dominant big fresh-water predators. In the oceans, early sharks are common and quite diverse; echinoderms (especially crinoids and blastoids) abundant. Corals, bryozoa, goniatites and brachiopods (Productida, Spiriferida, etc.) very common, but trilobites and nautiloids decline. Glaciation in East Gondwana. Tuhua Orogeny in New Zealand tapers off.
330.9 ± 0.2

Viséan
346.7 ± 0.4*

Tournaisian
358.9 ± 0.4*

Devonian
Late
Famennian
First clubmosses, horsetails and ferns appear, as do the first seed-bearing plants (progymnosperms), first trees (the progymnosperm Archaeopteris), and first (wingless) insects. Strophomenid and atrypid brachiopods, rugose and tabulate corals, and crinoids are all abundant in the oceans. Goniatite ammonoids are plentiful, while squid-like coleoids arise. Trilobites and armoured agnaths decline, while jawed fishes (placoderms, lobe-finned and ray-finned fish, and early sharks) rule the seas. First amphibians still aquatic. "Old Red Continent" of Euramerica. Beginning of Acadian Orogeny for Anti-Atlas Mountains of North Africa, and Appalachian Mountains of North America, also the Antler, Variscan, and Tuhua Orogeny in New Zealand.
372.2 ± 1.6*

Frasnian
382.7 ± 1.6*

Middle
Givetian
387.7 ± 0.8*

Eifelian
393.3 ± 1.2*

Early
Emsian
407.6 ± 2.6*

Pragian
410.8 ± 2.8*

Lochkovian
419.2 ± 3.2*

Silurian
Pridoli
First vascular plants (the rhyniophytes and their relatives), first millipedes and arthropleurids on land. First jawed fishes, as well as many armoured jawless fish, populate the seas. Sea-scorpions reach large size. Tabulate and rugose corals, brachiopods (Pentamerida, Rhynchonellida, etc.), and crinoids all abundant. Trilobites and mollusks diverse; graptolites not as varied. Beginning of Caledonian Orogeny for hills in England, Ireland, Wales, Scotland, and the Scandinavian Mountains. Also continued into Devonian period as the Acadian Orogeny, above. Taconic Orogeny tapers off. Lachlan Orogeny on Australian continent tapers off.
423 ± 2.3*

Ludlow
Ludfordian
425.6 ± 0.9*

Gorstian
427.4 ± 0.5*

Wenlock
Homerian
430.5 ± 0.7*

Sheinwoodian
433.4 ± 0.8*

Llandovery
Telychian
438.5 ± 1.1*

Aeronian
440.8 ± 1.2*

Rhuddanian
443.8 ± 1.5*

Ordovician
Late
Hirnantian
Invertebrates diversify into many new types (e.g., long straight-shelled cephalopods). Early corals, articulate brachiopods (Orthida, Strophomenida, etc.), bivalves, nautiloids, trilobites, ostracods, bryozoa, many types of echinoderms (crinoids, cystoids, starfish, etc.), branched graptolites, and other taxa all common. Conodonts (early planktonic vertebrates) appear. First green plants and fungi on land. Ice age at end of period.
445.2 ± 1.4*

Katian
453 ± 0.7*

Sandbian
458.4 ± 0.9*

Middle
Darriwilian
467.3 ± 1.1*

Dapingian
470 ± 1.4*

Early
Floian
(formerly Arenig)
477.7 ± 1.4*

Tremadocian
485.4 ± 1.9*

Cambrian
Furongian
Stage 10
Major diversification of life in the Cambrian Explosion. Numerous fossils; most modern animal phyla appear. First chordates appear, along with a number of extinct, problematic phyla. Reef-building Archaeocyatha abundant; then vanish. Trilobites, priapulid worms, sponges, inarticulate brachiopods (unhinged lampshells), and numerous other animals. Anomalocarids are giant predators, while many Ediacaran fauna die out. Prokaryotes, protists (e.g., forams), fungi and algae continue to present day. Gondwana emerges. Petermann Orogeny on the Australian continent tapers off (550–535 Ma). Ross Orogeny in Antarctica. Adelaide Geosyncline (Delamerian Orogeny), majority of orogenic activity from 514–500 Ma. Lachlan Orogeny on Australian continent, c. 540–440 Ma. Atmospheric CO2 content roughly 15 times present-day (Holocene) levels (6000 ppmv compared to today's 400 ppmv)[29][f]
~489.5

Jiangshanian
~494*

Paibian
~497*

Series 3
Guzhangian
~500.5*

Drumian
~504.5*

Stage 5
~509

Series 2
Stage 4
~514

Stage 3
~521

Terreneuvian
Stage 2
~529

Fortunian
~541 ± 1.0*

Precambrian[i]
Proterozoic[j]
Neoproterozoic[j]
Ediacaran
Good fossils of the first multi-celled animals. Ediacaran biota flourish worldwide in seas. Simple trace fossils of possible worm-like Trichophycus, etc. First sponges and trilobitomorphs. Enigmatic forms include many soft-jellied creatures shaped like bags, disks, or quilts (like Dickinsonia). Taconic Orogeny in North America. Aravalli Range orogeny in Indian Subcontinent. Beginning of Petermann Orogeny on Australian continent. Beardmore Orogeny in Antarctica, 633–620 Ma.
~635*

Cryogenian
Possible "Snowball Earth" period. Fossils still rare. Rodinia landmass begins to break up. Late Ruker / Nimrod Orogeny in Antarctica tapers off.
~720[k]

Tonian
Rodinia supercontinent persists. Sveconorwegian orogeny ends. Trace fossils of simple multi-celled eukaryotes. First radiation of dinoflagellate-like acritarchs. Grenville Orogeny tapers off in North America. Pan-African orogeny in Africa. Lake Ruker / Nimrod Orogeny in Antarctica, 1,000 ± 150 Ma. Edmundian Orogeny (c. 920 – 850 Ma), Gascoyne Complex, Western Australia. Adelaide Geosyncline laid down on Australian continent, beginning of Adelaide Geosyncline (Delamerian Orogeny) in Australia.
1000[k]

Mesoproterozoic[j]
Stenian
Narrow highly metamorphic belts due to orogeny as Rodinia forms. Sveconorwegian orogeny starts. Late Ruker / Nimrod Orogeny in Antarctica possibly begins. Musgrave Orogeny (c. 1,080 Ma), Musgrave Block, Central Australia.
1200[k]

Ectasian
Platform covers continue to expand. Green algae colonies in the seas. Grenville Orogeny in North America.
1400[k]

Calymmian
Platform covers expand. Barramundi Orogeny, McArthur Basin, Northern Australia, and Isan Orogeny, c.1,600 Ma, Mount Isa Block, Queensland
1600[k]

Paleoproterozoic[j]
Statherian
First complex single-celled life: protists with nuclei. Columbia is the primordial supercontinent. Kimban Orogeny in Australian continent ends. Yapungku Orogeny on Yilgarn craton, in Western Australia. Mangaroon Orogeny, 1,680–1,620 Ma, on the Gascoyne Complex in Western Australia. Kararan Orogeny (1,650 Ma), Gawler Craton, South Australia.
1800[k]

Orosirian
The atmosphere becomes oxygenic. Vredefort and Sudbury Basin asteroid impacts. Much orogeny. Penokean and Trans-Hudsonian Orogenies in North America. Early Ruker Orogeny in Antarctica, 2,000–1,700 Ma. Glenburgh Orogeny, Glenburgh Terrane, Australian continent c. 2,005–1,920 Ma. Kimban Orogeny, Gawler craton in Australian continent begins.
2050[k]

Rhyacian
Bushveld Igneous Complex forms. Huronian glaciation.
2300[k]

Siderian
Oxygen catastrophe: banded iron formations forms. Sleaford Orogeny on Australian continent, Gawler Craton 2,440–2,420 Ma.
2500[k]

Archean[j]
Neoarchean[j]
Stabilization of most modern cratons; possible mantle overturn event. Insell Orogeny, 2,650 ± 150 Ma. Abitibi greenstone belt in present-day Ontario and Quebec begins to form, stabilizes by 2,600 Ma.
2800[k]

Mesoarchean[j]
First stromatolites (probably colonial cyanobacteria). Oldest macrofossils. Humboldt Orogeny in Antarctica. Blake River Megacaldera Complex begins to form in present-day Ontario and Quebec, ends by roughly 2,696 Ma.
3200[k]

Paleoarchean[j]
First known oxygen-producing bacteria. Oldest definitive microfossils. Oldest cratons on Earth (such as the Canadian Shield and the Pilbara Craton) may have formed during this period.[l] Rayner Orogeny in Antarctica.
3600[k]

Eoarchean[j]
Simple single-celled life (probably bacteria and archaea). Oldest probable microfossils. The first life forms and self-replicating RNA molecules evolve around 4,000 Ma, after the Late Heavy Bombardment ends on Earth. Napier Orogeny in Antarctica, 4,000 ± 200 Ma.
~4000

Hadean[j][m]
Early Imbrian (Neohadean) (unofficial)[j][n]
Indirect photosynthetic evidence (e.g., kerogen) of primordial life. This era overlaps the beginning of the Late Heavy Bombardment of the Inner Solar System, produced possibly by the planetary migration of Neptune into the Kuiper belt as a result of orbital resonances between Jupiter and Saturn. Oldest known rock (4,031 to 3,580 Ma).[30]
4130[31]

Nectarian (Mesohadean) (unofficial)[j][n]
Possible first appearance of plate tectonics. This unit gets its name from the lunar geologic timescale when the Nectaris Basin and other greater lunar basins form by big impact events. Earliest evidence for life based on unusually high amounts of light isotopes of carbon, a common sign of life.
4280[31]

Basin Groups (Paleohadean) (unofficial)[j][n]
End of the Early Bombardment Phase. Oldest known mineral (Zircon, 4,404 ± 8 Ma). Asteroids and comets bring water to Earth.[32]
4533[31]

Cryptic (Eohadean) (unofficial)[j][n]
Formation of Moon (4,533 to 4,527 Ma), probably from giant impact, since the end of this era. Formation of Earth (4,570 to 4,567.17 Ma), Early Bombardment Phase begins. Formation of Sun (4,680 to 4,630 Ma) .
4600

text: Proposed Precambrian timeline[edit]

text: The ICS's Geologic Time Scale 2012 book which includes the new approved time scale also displays a proposal to substantially revise the Precambrian time scale to reflect important events such as the formation of the Earth or the Great Oxidation Event, among others, while at the same time maintaining most of the previous chronostratigraphic nomenclature for the pertinent time span.[33] (See also Period (geology)#Structure.)

text:
Hadean Eon – 4600–4031 MYA[contradictory]

Chaotian Era – 4600–4404 MYA – the name alluding both to the mythological Chaos and the chaotic phase of planet formation[33][34][35][contradictory]
Jack Hillsian or Zirconian Era – 4404–4031 MYA – both names allude to the Jack Hills Greenstone Belt which provided the oldest mineral grains on Earth, zircons[33][34]

Archean Eon – 4031–2420 MYA

Paleoarchean Era – 4031–3490 MYA

Acastan Period – 4031–3810 MYA – named after the Acasta Gneiss[33][34]
Isuan Period – 3810–3490 MYA – named after the Isua Greenstone Belt[33]

Mesoarchean Era – 3490–2780 MYA

Vaalbaran Period – 3490–3020 MYA – a portmanteau based on the names of the Kapvaal (Southern Africa) and Pilbara (Western Australia) cratons[33]
Pongolan Period – 3020–2780 MYA – named after the Pongola Supergroup[33]

Neoarchean Era – 2780–2420 MYA

Methanian Period – 2780–2630 MYA – named for the inferred predominance of methanotrophic prokaryotes[33]
Siderian Period – 2630–2420 MYA – named for the voluminous banded iron formations formed within its duration[33]

Proterozoic Eon – 2420–541 MYA

Paleoproterozoic Era – 2420–1780 MYA

Oxygenian Period – 2420–2250 MYA – named for displaying the first evidence for a global oxidizing atmosphere[33]
Jatulian or Eukaryian Period – 2250–2060 MYA – names are respectively for the Lomagundi–Jatuli δ13C isotopic excursion event spanning its duration, and for the (proposed)[36][37] first fossil appearance of eukaryotes[33]
Columbian Period – 2060–1780 MYA – named after the supercontinent Columbia[33]

Mesoproterozoic Era – 1780–850 MYA

Rodinian Period – 1780–850 MYA – named after the supercontinent Rodinia, stable environment[33]

Neoproterozoic Era – 850–541 MYA

Cryogenian Period – 850–630 MYA – named for the occurrence of several glaciations[33]
Ediacaran Period – 630–541 MYA

text: Shown to scale:

text: Compare with the current official timeline, not shown to scale:


document_title: Bye, Felicia

question_text: where did the phrase by felicia come from

text: Bye, Felicia

text: The phrase "Bye, Felicia" (actually spelled "Felisha" in the cast listing) came from a scene in the American stoner buddy crime comedy film Friday (1995). According to Ice Cube, who starred in the film and co-wrote its script, "Bye, Felicia" is "the phrase 'to get anyone out of your face'," and, as it was used in the Friday scene, is generally intended as a dismissive kiss-off.[1]

text: Popular culture[edit]

text: The saying gained popularity and continues to be used, even by people who have never seen the film. In 2009, it entered the lexicon of RuPaul's Drag Race, an American reality competition television series. However, People said "even that wouldn't necessarily account for the phrase extending beyond the cultures that would watch either Friday, Drag Race or both. (Seriously, just look how often people use it on Twitter.)"[1] Furthermore, the magazine said of the phrase, "So when your square friend uses it, take a little bit of pleasure in knowing they're referencing a stoner comedy – or a drag reality show referencing a stoner comedy – even if they have no idea."[1]

text: In 2014, VH1 began airing a television show called Bye Felicia, and American R&B-pop singer Jordin Sparks released a mixtape titled #ByeFelicia.[1][2] According to Google Trends, the phrase reached its highest usage in mid-2015.[1]

text: On December 14, 2017, Robin Roberts, a host of ABC TV’s Good Morning America, used the phrase to conclude a segment about Omarosa Manigault Newman's departure from the Trump administration staff.[3]