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elements, isotopes
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  - stable isotopes
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    - Ar-40/Ar-39 (4)
    - C-13 (2)
    - C-13/C-12 (159)
    - D/H (34)
    - deuterium (16)
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    - Hf-177/Hf-176 (40)
    - Kr-84 (2)
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    - O-18 (1)
    - O-18/O-16 (186)
    - Os-188/Os-187 (1)
    - Pb-206/Pb-204 (15)
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    - Pb-208 (1)
    - Pb-208/Pb-204 (9)
    - Pb-208/Pb-206 (2)
    - Rb-87/Sr-86 (1)
    - S-33 (1)
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- large-ion lithophile elements (1)
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- metals
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      - Sr-87/Sr-86 (52)
  - aluminum
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  - lead
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    - Pb-207 (1)
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    - Pb-207/Pb-206 (6)
    - Pb-208 (1)
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    - U-238/Pb-206 (3)
  - manganese (5)
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      - Nd-144/Nd-143 (35)
      - Sm-147/Nd-144 (7)
    - samarium
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    - scandium (3)
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- noble gases
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  - krypton
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- oxygen
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- phosphorus (4)
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- sulfur
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- trace metals (3)
fossils
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- Chordata
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    - Gastropoda (15)
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        Fusulinidae (6)
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        Orbitoidacea
        
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        Nummulites (2)
      - Textulariina
        
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- microfossils
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- palynomorphs
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- Plantae
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        Emiliania huxleyi (1)
      - Gephyrocapsa
        
        Gephyrocapsa oceanica (1)
    - diatoms (9)
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  - Pteridophyta
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      - Archaeopteris (3)
      - Dicroidium (2)
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        Calamites (1)
      - Sphenophyllum (1)
  - Spermatophyta
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        Alnus (1)
        
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    - Gymnospermae
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        Pinaceae
        
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      - Glossopteridales
        
        Gangamopteris (2)
        
        Glossopteris (5)
      - Pteridospermae (3)
- problematic fossils
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- prokaryotes (1)
- Pterobranchia (3)
- thallophytes (13)
- tracks (27)
- trails (5)
geochronology methods
- (U-Th)/He (26)
- Ar/Ar (72)
- exposure age (3)
- fission-track dating (59)
- He/He (2)
- K/Ar (43)
- Lu/Hf (24)
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- paleomagnetism (68)
- Pb/Pb (14)
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- Rb/Sr (17)
- Re/Os (4)
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- thermochronology (34)
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- U/Pb (439)
- U/Th/Pb (10)
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geologic age
- Cenozoic
  - Agbada Formation (5)
  - Bakhtiari Formation (1)
  - Blancan (1)
  - Glenns Ferry Formation (1)
  - Koobi Fora Formation (1)
  - lower Cenozoic (6)
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  - Quaternary
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    - Kazusa Group (1)
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        Calabrian (1)
        
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        Lake Lisan (1)
        
        Tyrrhenian (1)
        
        Weichselian
        
        upper Weichselian
        
        Younger Dryas (1)
        
        Wurm (1)
    - upper Quaternary (2)
  - Sirius Group (1)
  - Siwalik System (17)
  - Stone Age
    - Paleolithic
      - Aurignacian (1)
  - Tertiary
    - Anahuac Formation (1)
    - Arikaree Group (6)
    - Arikareean (1)
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    - Catahoula Formation (5)
    - Challis Volcanics (3)
    - lower Tertiary (14)
    - Maikop Series (1)
    - middle Tertiary
      - Talang Akar Formation (3)
    - Muddy Creek Formation (1)
    - Neogene
      - Browns Park Formation (4)
      - Capistrano Formation (3)
      - Cuddalore Series (2)
      - Deschutes Formation (1)
      - Etchegoin Formation (1)
      - Miocene
        
        Antelope Shale (3)
        
        Astoria Formation (1)
        
        Calvert Formation (2)
        
        Clarendonian (1)
        
        Fleming Formation (1)
        
        Guantao Formation (7)
        
        Honda Group (1)
        
        lower Miocene
        
        Aquitanian (4)
        
        Burdigalian (6)
        
        Kasauli Series (1)
        
        Saucesian (1)
        
        middle Miocene
        
        Choptank Formation (2)
        
        Langhian (4)
        
        San Onofre Breccia (1)
        
        Serravallian (2)
        
        Mohnian (2)
        
        Oakville Sandstone (3)
        
        Oficina Formation (4)
        
        Paintbrush Tuff (1)
        
        Sarmatian (1)
        
        Stevens Sandstone (5)
        
        Surma Group (10)
        
        Temblor Formation (4)
        
        upper Miocene
        
        Chinji Formation (3)
        
        Messinian
        
        Messinian Salinity Crisis (1)
        
        Modelo Formation (2)
        
        Mount Messenger Formation (3)
        
        Pontian (1)
        
        Puente Formation (2)
        
        Santa Cruz Mudstone (3)
        
        Santa Margarita Formation (3)
        
        Tortonian (7)
        
        Vindobonian (1)
      - Ogallala Formation (3)
      - Pliocene
        
        Cimmerian (2)
        
        lower Pliocene (13)
        
        middle Pliocene (1)
        
        upper Pliocene
        
        Chowan River Formation (1)
        
        Yorktown Formation (1)
      - Purisima Formation (2)
      - Tesuque Formation (1)
      - upper Neogene (1)
    - Neyveli Lignite (1)
    - Paleogene
      - Barail Group (10)
      - Black Mingo Group (1)
      - Chadron Formation (1)
      - Claron Formation (1)
      - Dongying Formation (14)
      - Eocene
        
        Absaroka Supergroup (1)
        
        Annot Sandstone (10)
        
        Baca Formation (1)
        
        Bracklesham Group (1)
        
        Bridger Formation (1)
        
        Chuckanut Formation (2)
        
        Chumstick Formation (2)
        
        Clarno Formation (1)
        
        Colton Formation (2)
        
        Cozy Dell Formation (1)
        
        Crescent Formation (1)
        
        Flournoy Formation (2)
        
        Golden Valley Formation (1)
        
        Green River Formation (21)
        
        Lake Gosiute (4)
        
        Lake Uinta (1)
        
        Lookingglass Formation (3)
        
        lower Eocene
        
        Cuisian (1)
        
        Misoa Formation (1)
        
        Wasatchian (1)
        
        Willwood Formation (6)
        
        Wind River Formation (4)
        
        Ypresian (7)
        
        Matilija Formation (1)
        
        middle Eocene
        
        Bartonian (2)
        
        Carrizo Sand (4)
        
        Claiborne Group (5)
        
        Cockfield Formation (2)
        
        Laney Shale Member (2)
        
        Lutetian (5)
        
        Queen City Formation (4)
        
        Sparta Sand (1)
        
        Tallahatta Formation (1)
        
        Tyee Formation (11)
        
        Yegua Formation (4)
        
        Mirador Formation (5)
        
        Mission Valley Formation (1)
        
        Nanjemoy Formation (1)
        
        Narizian (1)
        
        Parachute Creek Member (2)
        
        Subathu Formation (6)
        
        Umpqua Formation (1)
        
        upper Eocene
        
        Cowlitz Formation (2)
        
        Jackson Group (4)
        
        La Meseta Formation (1)
        
        Priabonian (4)
        
        Tejon Formation (1)
        
        Twiggs Clay (1)
        
        Wilkins Peak Member (2)
      - Flagstaff Formation (1)
      - Hanna Formation (1)
      - Ilerdian (1)
      - Kapuni Group (3)
      - Kenai Group (4)
      - lower Paleogene (7)
      - Oligocene
        
        Fontainebleau Sandstone (27)
        
        Frio Formation (41)
        
        Glendon Limestone (1)
        
        Hackberry Formation (2)
        
        Hemlock Conglomerate (1)
        
        lower Oligocene
        
        Rupelian (4)
        
        Stampian (2)
        
        middle Oligocene (9)
        
        upper Oligocene
        
        Chattian (2)
        
        Vicksburg Group (11)
      - Orca Group (2)
      - Paleocene
        
        Bullion Creek Formation (1)
        
        Clayton Formation (1)
        
        lower Paleocene
        
        Danian (11)
        
        K-T boundary (13)
        
        Puercan (2)
        
        Torrejonian (2)
        
        Ludlow Member (2)
        
        Maria Farinha Formation (1)
        
        middle Paleocene
        
        Selandian (2)
        
        Midway Group (2)
        
        Nacimiento Formation (3)
        
        Ravenscrag Formation (1)
        
        Sentinel Butte Formation (1)
        
        Tongue River Member (1)
        
        Tullock Member (2)
        
        upper Paleocene
        
        Thanetian (6)
        
        Tiffanian (2)
      - Paleocene-Eocene Thermal Maximum (3)
      - Refugian (2)
      - Renova Formation (2)
      - Sespe Formation (4)
      - Tyonek Formation (7)
      - upper Paleogene (1)
      - Wasatch Formation (15)
      - White River Group (1)
      - Wilcox Group (44)
      - Yahuarango Formation (1)
    - Shahejie Formation (31)
    - upper Tertiary (2)
    - Vaqueros Formation (4)
  - Tulare Formation (3)
  - upper Cenozoic
    - Chesapeake Group (2)
    - Pico Formation (4)
  - Wildcat Group (3)
  - Yakataga Formation (3)
- Coal Measures (11)
- Dalradian (14)
- Laurentide ice sheet (2)
- Mesozoic
  - Bisbee Group (2)
  - Carrara Marble (1)
  - Cretaceous
    - Alisitos Formation (1)
    - Asu River Group (1)
    - Bahariya Formation (3)
    - Blairmore Group (3)
    - Chatsworth Formation (1)
    - Chonta Formation (2)
    - Colorado Group (14)
    - Comanchean
      - Antlers Sands (1)
      - Buda Limestone (1)
      - Edwards Formation (2)
      - Fredericksburg Group (1)
      - Glen Rose Formation (1)
      - Paluxy Formation (1)
      - Rodessa Formation (3)
      - Travis Peak Formation (10)
      - Washita Group (2)
    - Dakota Formation (28)
    - Gosau Formation (1)
    - Graneros Shale (3)
    - Kuskokwim Group (2)
    - Logan Canyon Formation (8)
    - Lower Cretaceous
      - Agrio Formation (2)
      - Albian
        
        lower Albian (3)
        
        Pinda Formation (1)
        
        upper Albian (8)
      - Antlers Sands (1)
      - Aptian (40)
      - Areado Formation (1)
      - Barremian (13)
      - Bear River Formation (1)
      - Berriasian (15)
      - Blackleaf Formation (3)
      - Bluesky Formation (10)
      - Burro Canyon Formation (7)
      - Cadomin Formation (4)
      - Cedar Mountain Formation (6)
      - Cheyenne Sandstone (1)
      - Clearwater Formation (7)
      - Edwards Formation (2)
      - Fall River Formation (6)
      - Fredericksburg Group (1)
      - Gething Formation (7)
      - Glen Rose Formation (1)
      - Hauterivian (9)
      - Hosston Formation (4)
      - Isachsen Formation (2)
      - Kemik Sandstone (1)
      - Kiowa Formation (3)
      - Kootenay Formation (4)
      - Lagoa Feia Formation (1)
      - Lakota Formation (1)
      - Mannville Group (41)
      - McMurray Formation (31)
      - Mesa Rica Sandstone (3)
      - Missisauga Formation (13)
      - Moosebar Formation (3)
      - Mowry Shale (11)
      - Muddy Sandstone (13)
      - Muderong Shale (1)
      - Mural Limestone (1)
      - Neocomian (15)
      - Paluxy Formation (1)
      - Pebble Shale (2)
      - Rodessa Formation (3)
      - Skull Creek Shale (4)
      - Sligo Formation (1)
      - Speeton Clay (1)
      - Spirit River Formation (13)
      - Torok Formation (6)
      - Travis Peak Formation (10)
      - Valanginian (13)
      - Wealden (5)
    - Lower Greensand (3)
    - Macae Formation (2)
    - Mancos Shale (35)
    - Middle Cretaceous
      - Bhuj Series (1)
      - Winton Formation (1)
    - Nanushuk Group (6)
    - Nenjiang Formation (2)
    - Potomac Group (2)
    - Qingshankou Formation (5)
    - Quantou Formation (4)
    - Upper Cretaceous
      - Adamantina Formation (1)
      - Almond Formation (9)
      - Ariyalur Stage (1)
      - Bagh Beds (3)
      - Bearpaw Formation (6)
      - Belle Fourche Shale (4)
      - Belly River Formation (8)
      - Black Creek Formation (1)
      - Blackhawk Formation (32)
      - Buda Limestone (1)
      - Campanian
        
        Dinosaur Park Formation (2)
        
        lower Campanian (2)
        
        upper Campanian (3)
      - Cardium Formation (31)
      - Carlile Shale (6)
      - Castlegate Sandstone (24)
      - Cenomanian
        
        Dunvegan Formation (10)
        
        lower Cenomanian (1)
        
        upper Cenomanian (5)
      - Codell Sandstone Member (4)
      - Cody Shale (5)
      - Coker Formation (1)
      - Colville Group (2)
      - Coniacian (13)
      - Crevasse Canyon Formation (4)
      - Dawson Canyon Formation (4)
      - Djadokhta Formation (1)
      - Duwi Formation (2)
      - Eagle Sandstone (4)
      - Edmonton Group (1)
      - Eutaw Formation (2)
      - Ferron Sandstone Member (29)
      - Fort Hays Limestone Member (1)
      - Fox Hills Formation (7)
      - Frontier Formation (33)
      - Fruitland Formation (2)
      - Gallup Sandstone (12)
      - Greenhorn Limestone (6)
      - Gulfian
        
        Aguja Formation (2)
        
        Austin Chalk (4)
        
        Austin Group (1)
        
        Eagle Ford Formation (6)
        
        Navarro Group (1)
        
        Olmos Formation (1)
        
        Taylor Marl (1)
        
        Woodbine Formation (10)
      - Hell Creek Formation (6)
      - Hornbrook Formation (1)
      - Horseshoe Canyon Formation (4)
      - Izumi Group (1)
      - Javelina Formation (1)
      - Judith River Formation (6)
      - Kaiparowits Formation (2)
      - Kanguk Formation (1)
      - Kirtland Shale (2)
      - Kodiak Formation (1)
      - K-T boundary (13)
      - La Luna Formation (1)
      - Lameta Formation (2)
      - Lance Formation (7)
      - Laramie Formation (4)
      - Lewis Shale (16)
      - Maestrichtian
        
        upper Maestrichtian (3)
      - Maevarano Formation (1)
      - Marilia Formation (1)
      - Marshalltown Formation (1)
      - Menefee Formation (1)
      - Mesaverde Group (43)
      - Milk River Formation (6)
      - Moreno Formation (4)
      - Navesink Formation (3)
      - Neuquen Group (4)
      - Niobrara Formation (6)
      - Ojo Alamo Sandstone (5)
      - Oldman Formation (3)
      - Parkman Sandstone (1)
      - Peedee Formation (1)
      - Pictured Cliffs Sandstone (3)
      - Pierre Shale (10)
      - Point Loma Formation (2)
      - Point Lookout Sandstone (3)
      - Price River Formation (3)
      - Ripley Formation (1)
      - Rock Springs Formation (2)
      - Rosario Formation (5)
      - Saint Mary River Formation (3)
      - Santonian (17)
      - Schrader Bluff Formation (1)
      - Senonian (78)
      - Shannon Sandstone Member (6)
      - Star Point Sandstone (7)
      - Straight Cliffs Formation (10)
      - Sussex Sandstone Member (3)
      - Teapot Sandstone Member (1)
      - Tropic Shale (2)
      - Turonian
        
        lower Turonian (2)
        
        middle Turonian (3)
      - Tuscaloosa Formation (16)
      - Two Medicine Formation (3)
      - Vivian Formation (3)
      - Wahweap Formation (5)
      - Wall Creek Member (2)
      - Williams Fork Formation (12)
      - Wyandot Formation (1)
    - Valdez Group (2)
    - Viking Formation (24)
    - Whitemud Formation (4)
  - Franciscan Complex (24)
  - Glen Canyon Group (4)
  - Great Valley Sequence (19)
  - Jurassic
    - Aztec Sandstone (11)
    - Bazhenov Formation (9)
    - Carmel Formation (8)
    - Clarens Formation (8)
    - Coast Range Ophiolite (2)
    - Fernie Formation (7)
    - Ferrar Group (1)
    - Heather Formation (12)
    - Kingak Shale (4)
    - Ladner Group (1)
    - Lathi Formation (1)
    - Lower Jurassic
      - Dunlin Group (3)
      - East Berlin Formation (1)
      - Hettangian (5)
      - Laberge Group (3)
      - lower Liassic (9)
      - Luxembourg Sandstone (1)
      - middle Liassic (4)
      - Nordegg Member (3)
      - Pliensbachian (11)
      - Portland Formation (2)
      - Sinemurian (7)
      - Toarcian
        
        lower Toarcian (2)
      - upper Liassic (4)
    - Mic Mac Formation (3)
    - Middle Jurassic
      - Aalenian (5)
      - Bajocian
        
        Brent Group (51)
        
        Broom Formation (5)
        
        Etive Formation (8)
        
        Ness Formation (13)
        
        Rannoch Formation (11)
        
        Tarbert Formation (7)
      - Bathonian
        
        upper Bathonian (1)
      - Callovian (19)
      - Dogger (4)
      - Page Sandstone (8)
      - Summerville Formation (1)
      - Todilto Formation (1)
      - Xishanyao Formation (1)
    - Norphlet Formation (22)
    - Opalinus Clay (1)
    - Oxford Clay (1)
    - San Rafael Group (4)
    - Twin Creek Limestone (2)
    - Upper Jurassic
      - Arab Formation (1)
      - Bossier Formation (3)
      - Bowser Lake Group (3)
      - Brushy Basin Member (6)
      - Buckner Formation (3)
      - Cotton Valley Group (9)
      - Entrada Sandstone (29)
      - Fulmar Formation (22)
      - Galice Formation (2)
      - Hanifa Formation (1)
      - Haynesville Formation (8)
      - Jeanne d'Arc Formation (2)
      - Josephine Ophiolite (1)
      - Kimmeridge Clay (23)
      - Kimmeridgian (20)
      - La Casita Formation (1)
      - Morrison Formation (45)
      - Naknek Formation (3)
      - Oxfordian
        
        middle Oxfordian (1)
        
        upper Oxfordian (1)
      - Portlandian (6)
      - Salt Wash Sandstone Member (8)
      - Sarayaquillo Formation (1)
      - Schuler Formation (2)
      - Smackover Formation (17)
      - Stump Formation (1)
      - Sundance Formation (7)
      - Swift Formation (2)
      - Tithonian (14)
      - Volgian (6)
      - Westwater Canyon Sandstone Member (1)
  - Kayenta Formation (7)
  - Longarm Formation (1)
  - lower Mesozoic (9)
  - McHugh Complex (1)
  - middle Mesozoic (2)
  - Mist Mountain Formation (3)
  - Moenave Formation (1)
  - Murihiku Supergroup (1)
  - Navajo Sandstone (56)
  - Newark Supergroup (7)
  - Nicoya Complex (1)
  - Nugget Sandstone (11)
  - Passaic Formation (2)
  - Pucara Group (1)
  - Serra Geral Formation (3)
  - Shimanto Group (1)
  - Statfjord Formation (13)
  - Triassic
    - Charlie Lake Formation (6)
    - Fremouw Formation (3)
    - Hawkesbury Sandstone (5)
    - Liard Formation (2)
    - Lower Triassic
      - Bunter
        
        Voltzia Sandstone (1)
      - Induan (1)
      - Olenekian (1)
      - Panchet Series (1)
      - Permian-Triassic boundary (15)
      - Smithian (2)
      - Werfenian (1)
    - Middle Triassic
      - Anisian (4)
      - Doig Formation (15)
      - Ladinian (4)
      - Muschelkalk (2)
    - Moenkopi Formation (6)
    - Montney Formation (13)
    - Narrabeen Group (1)
    - Sherwood Sandstone (17)
    - Shublik Formation (4)
    - Takla Group (1)
    - Upper Triassic
      - Baldonnel Formation (1)
      - Carnian (12)
      - Chinle Formation (17)
      - Dockum Group (5)
      - Keuper (5)
      - Luning Formation (2)
      - Mercia Mudstone (4)
      - Molteno Formation (5)
      - Norian (10)
      - Petrified Forest Member (1)
      - Rhaetian (10)
      - Sag River Sandstone (1)
      - Santa Rosa Sandstone (2)
      - Shinarump Member (3)
      - Stormberg Series (2)
      - Xujiahe Formation (10)
      - Yanchang Formation (33)
  - upper Mesozoic (10)
  - Vaca Muerta Formation (3)
  - Wingate Sandstone (9)
  - Yanshanian (6)
- MIS 6 (1)
- Moldanubian (1)
- Paleozoic
  - Acatlan Complex (2)
  - Arbuckle Group (1)
  - Bedford Shale (3)
  - Berea Sandstone (57)
  - Cambrian
    - Acadian (3)
    - Brigham Group (1)
    - Lower Cambrian
      - Atdabanian (1)
      - Chilhowee Group (3)
      - Gog Group (3)
      - Rome Formation (3)
      - Shady Dolomite (2)
      - Terreneuvian (2)
      - Tommotian (2)
      - Zabriskie Quartzite (2)
    - Middle Cambrian
      - Burgess Shale (1)
      - Flathead Sandstone (2)
    - Mount Read Volcanics (2)
    - Semri Series (1)
    - Tapeats Sandstone (3)
    - Upper Cambrian
      - Copper Ridge Dolomite (4)
      - Dresbachian (1)
      - Eau Claire Formation (8)
      - Franconia Formation (1)
      - Galesville Sandstone (1)
      - Goldenville Formation (2)
      - Lamotte Sandstone (4)
      - Mount Simon Sandstone (27)
      - Pilgrim Formation (2)
      - Potsdam Sandstone (9)
      - Steptoean (1)
      - Wilberns Formation (1)
      - Wonewoc Formation (3)
  - Carboniferous
    - Albert Formation (5)
    - Amsden Formation (2)
    - Bartlesville Sand (4)
    - Benxi Formation (3)
    - Diamond Peak Formation (2)
    - Jackfork Group (12)
    - Lower Carboniferous
      - Dinantian (21)
    - Mabou Group (2)
    - Middle Carboniferous (5)
    - Mississippian
      - Barnett Shale (2)
      - Big Injun Sandstone (1)
      - Borden Group (1)
      - Chainman Shale (1)
      - Leadville Formation (1)
      - Lower Mississippian
        
        Fort Payne Formation (1)
        
        Kayak Shale (1)
        
        Kekiktuk Conglomerate (2)
        
        Kinderhookian
        
        Banff Formation (2)
        
        Lodgepole Formation (3)
        
        Osagian (2)
        
        Pocono Formation (9)
        
        Tournaisian (3)
      - Madison Group (5)
      - Middle Mississippian
        
        Visean (10)
      - Mission Canyon Limestone (3)
      - Price Formation (3)
      - Rampart Group (1)
      - Redwall Limestone (1)
      - Stanley Group (1)
      - Sunbury Shale (2)
      - Upper Mississippian
        
        Chesterian
        
        Aux Vases Sandstone (4)
        
        Cypress Sandstone (1)
        
        Renault Formation (4)
        
        Fayetteville Formation (1)
        
        Greenbrier Limestone (3)
        
        Hartselle Sandstone (6)
        
        Hinton Formation (1)
        
        Mauch Chunk Formation (2)
        
        Meramecian
        
        Sainte Genevieve Limestone (9)
        
        Salem Limestone (2)
        
        Warsaw Formation (1)
        
        Monteagle Limestone (2)
        
        Parkwood Formation (4)
        
        Pennington Formation (1)
        
        Pride Mountain Formation (1)
        
        Serpukhovian (5)
      - Windsor Group (1)
    - Namurian (23)
    - Pennsylvanian
      - Conemaugh Group (4)
      - Cumberland Group (3)
      - Freeport Formation (1)
      - Hermosa Group (3)
      - Herrin Coal Member (1)
      - Joggins Formation (4)
      - Lower Pennsylvanian
        
        Bashkirian (4)
        
        Caseyville Formation (5)
        
        Haymond Formation (6)
        
        Lee Formation (5)
        
        Morrowan
        
        Bloyd Formation (1)
        
        Pocahontas Formation (2)
      - Marble Falls Group (2)
      - Middle Pennsylvanian
        
        Allegheny Group (5)
        
        Atokan
        
        Atoka Formation (11)
        
        Breathitt Formation (5)
        
        Carbondale Formation (1)
        
        Desmoinesian
        
        Cherokee Group (9)
        
        Hartshorne Sandstone (3)
        
        Krebs Group (1)
        
        Marmaton Group (2)
        
        Spiro Sandstone (1)
        
        Dugger Formation (1)
        
        Kanawha Formation (3)
        
        Moscovian (2)
        
        Paradox Formation (3)
        
        Spoon Formation (2)
        
        Tradewater Formation (1)
      - Minturn Formation (3)
      - Monongahela Group (3)
      - Morien Group (3)
      - Morrow Formation (15)
      - Pottsville Group (11)
      - Red Fork Sandstone (6)
      - Saginaw Formation (1)
      - Sharon Conglomerate (2)
      - Smithwick Shale (1)
      - Strawn Series (7)
      - Upper Pennsylvanian
        
        Canyon Group (6)
        
        Cisco Group (7)
        
        Gzhelian (2)
        
        Kasimovian (1)
        
        Missourian
        
        Kansas City Group (1)
        
        Lansing Group (1)
        
        Wann Formation (1)
        
        Virgilian
        
        Tonganoxie Sandstone (1)
        
        Wescogame Formation (1)
      - Wapanucka Limestone (1)
      - Watahomigi Formation (1)
      - Westerly Granite (3)
    - Schoonover Sequence (1)
    - Silesian (1)
    - Springer Formation (3)
    - Tesnus Formation (1)
    - Upper Carboniferous
      - Millstone Grit (6)
      - Stephanian (3)
      - Talchir Series (1)
      - Uralian (1)
      - Westphalian (32)
  - Casper Formation (3)
  - Catskill Formation (3)
  - Chattanooga Shale (1)
  - Cow Head Group (1)
  - Deadwood Formation (5)
  - Devonian
    - Barre Granite (1)
    - Beaverhill Lake Group (1)
    - Chelmsford Granite (1)
    - Gile Mountain Formation (1)
    - Keg River Formation (1)
    - Lower Devonian
      - Battery Point Formation (1)
      - Emsian (6)
      - Gedinnian (1)
      - Lochkovian (3)
      - Oriskany Sandstone (8)
      - Pragian (1)
      - Seboomook Formation (1)
      - Shap Granite (1)
      - Siegenian (1)
      - York River Formation (2)
    - Middle Devonian
      - Detroit River Group (1)
      - Elk Point Group (2)
      - Givetian (5)
      - Hamilton Group (1)
      - Marcellus Shale (3)
      - Prairie Evaporite (3)
      - Sylvania Formation (2)
      - Tully Limestone (1)
    - Millboro Shale (1)
    - Muth Quartzite (1)
    - Old Red Sandstone (25)
    - Slave Point Formation (1)
    - Upper Devonian
      - Brallier Shale (2)
      - Canadaway Group (1)
      - Chemung Formation (1)
      - Cleveland Member (1)
      - Duperow Formation (1)
      - Famennian (5)
      - Frasnian
        
        Leduc Formation (1)
      - Grosmont Formation (3)
      - Hampshire Formation (5)
      - Jefferson Group (1)
      - Nisku Formation (1)
      - Ohio Shale (1)
      - Perry Formation (1)
      - Sonyea Group (1)
    - Upper Old Red Sandstone (1)
  - Dunkard Group (3)
  - Ellis Bay Formation (1)
  - Endicott Group (1)
  - Exshaw Formation (3)
  - Helderberg Group (4)
  - Honaker Trail Formation (2)
  - Horton Group (4)
  - Hunton Group (1)
  - Ishbel Group (1)
  - Itarare Subgroup (2)
  - Keyser Limestone (1)
  - Knox Group (8)
  - Lisburne Group (3)
  - lower Paleozoic
    - Conococheague Formation (2)
    - Rose Run Sandstone (6)
  - Maroon Formation (1)
  - middle Paleozoic (4)
  - Minnelusa Formation (14)
  - New Albany Shale (1)
  - Oquirrh Formation (2)
  - Ordovician
    - Chickamauga Group (1)
    - Eureka Quartzite (3)
    - Lower Ordovician
      - Arenigian (7)
      - Beekmantown Group (2)
      - Manitou Formation (1)
      - Manx Group (2)
      - Oneota Dolomite (1)
      - Tremadocian
        
        Halifax Formation (2)
    - Lushs Bight Group (1)
    - Majiagou Formation (1)
    - Martinsburg Formation (3)
    - Meguma Group (2)
    - Middle Ordovician
      - Blackriverian (2)
      - Bromide Formation (3)
      - Chazy Group (1)
      - Cloridorme Formation (2)
      - Dapingian (1)
      - Darriwilian (1)
      - Dolgeville Formation (1)
      - Everton Formation (1)
      - Glenwood Shale (2)
      - Llanvirnian (2)
      - Normanskill Formation (1)
      - Saint Peter Sandstone (20)
      - Simpson Group (7)
      - Stones River Group (1)
      - Winnipeg Formation (5)
    - Montoya Group (1)
    - Skiddaw Slates (2)
    - Trenton Group (4)
    - Upper Ordovician
      - Caradocian
        
        Borrowdale Volcanic Group (1)
      - Cincinnatian
        
        Richmondian (2)
      - Hirnantian (4)
      - Juniata Formation (4)
      - Maquoketa Formation (2)
      - Mohawkian (1)
      - Queenston Shale (3)
      - Reedsville Formation (2)
      - Sandbian (1)
      - Trentonian (2)
      - Yeoman Formation (1)
    - Utica Shale (5)
    - Vinini Formation (1)
    - Viola Limestone (3)
  - Permian
    - Buckley Formation (1)
    - Chase Group (1)
    - Coconino Sandstone (12)
    - Cutler Formation (12)
    - Damuda Series (1)
    - Ecca Group (15)
    - Esplanade Sandstone Member (1)
    - Gharif Formation (4)
    - Glorieta Sandstone (1)
    - Guadalupian
      - Bell Canyon Formation (6)
      - Brushy Canyon Formation (5)
      - Capitan Formation (2)
      - Cherry Canyon Formation (6)
      - Delaware Mountain Group (6)
      - Grayburg Formation (2)
      - Queen Formation (2)
      - Tansill Formation (1)
      - Wordian (1)
    - Kaibab Formation (6)
    - Kamthi Formation (6)
    - Khuff Formation (7)
    - Longtan Formation (1)
    - Lower Permian
      - Abo Formation (6)
      - Al Khlata Formation (1)
      - Barakar Stage (9)
      - Cherry Canyon Formation (6)
      - Cisuralian
        
        Artinskian (7)
        
        Asselian (3)
        
        Kungurian (7)
        
        Sakmarian (4)
      - Leman Sandstone Formation (7)
      - Leonardian
        
        Bone Spring Limestone (3)
        
        Clear Fork Group (1)
      - Opeche Shale (2)
      - Wichita Group (2)
      - Wolfcampian
        
        Hueco Limestone (2)
    - Lyons Sandstone (5)
    - Maokou Formation (1)
    - McCloud Limestone (1)
    - Middle Permian (8)
    - Mitu Group (1)
    - Newcastle Coal Measures (2)
    - Park City Formation (1)
    - Phosphoria Formation (5)
    - Ranger Canyon Formation (1)
    - Rotliegendes (45)
    - Shihezi Formation (12)
    - Stone Corral Formation (1)
    - Toroweap Formation (3)
    - Unayzah Formation (18)
    - Upper Permian
      - Kazanian (1)
      - Lopingian
        
        Changhsingian (1)
      - Permian-Triassic boundary (15)
      - Raniganj Formation (4)
      - Tatarian (1)
      - Zechstein (18)
    - Vryheid Formation (3)
    - Whitehill Formation (1)
    - Yates Formation (3)
    - Yeso Formation (3)
  - Read Bay Formation (1)
  - Sauk Sequence (9)
  - Shoo Fly Complex (4)
  - Silurian
    - Bass Islands Dolomite (1)
    - Clinch Sandstone (1)
    - Lockport Formation (1)
    - Lower Silurian
      - Grimsby Sandstone (8)
      - Llandovery
        
        Aberystwyth Grits (2)
        
        Aeronian (1)
        
        Rhuddanian (1)
      - Qalibah Formation (4)
      - Tuscarora Formation (16)
      - Wenlock
        
        Homerian (1)
      - Whirlpool Sandstone (7)
    - Middle Silurian
      - Clinton Group (10)
      - Keefer Sandstone (6)
      - McKenzie Formation (3)
      - Rose Hill Formation (3)
    - Niagaran (2)
    - Rockwood Formation (1)
    - Upper Silurian
      - Cayugan
        
        Tonoloway Limestone (2)
        
        Williamsport Sandstone (1)
      - Ludlow
        
        Gorstian (2)
        
        Ludfordian (2)
      - Pridoli (3)
      - Salina Group (2)
  - Supai Formation (2)
  - Taiyuan Formation (9)
  - Talchir Formation (6)
  - Tensleep Sandstone (16)
  - Tippecanoe Sequence (1)
  - upper Paleozoic
    - Antrim Shale (1)
    - Bakken Formation (8)
    - Copacabana Group (1)
    - Dwyka Formation (7)
    - Fountain Formation (10)
    - Kaskaskia Sequence (1)
    - Pictou Group (2)
    - Shanxi Formation (8)
    - Tarma Group (1)
    - Tirrawarra Sandstone (4)
    - Wood River Formation (1)
  - Weber Sandstone (9)
  - Wells Formation (1)
  - Woodford Shale (4)
- Phanerozoic (18)
- Precambrian
  - Archean
    - Aravalli System (2)
    - Fig Tree Group (1)
    - Gilman Formation (1)
    - Mesoarchean (9)
    - Neoarchean (6)
    - Paleoarchean (7)
    - Peninsular Gneiss (1)
    - Sausar Series (1)
    - Swaziland Supergroup (1)
    - Warrawoona Group (1)
  - Bijawar System (1)
  - Central Rand Group (2)
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        Gowganda Formation (2)
        
        Onaping Formation (1)
        
        Signal Hill Formation (1)
      - Isan Orogeny (1)
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        Copper Harbor Conglomerate (6)
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        Belt Supergroup (8)
        
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        Ravalli Group (1)
        
        Roper Group (1)
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        Cryogenian (9)
        
        Ediacaran
        
        Wonoka Formation (2)
        
        Hadrynian (1)
        
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        Otavi Group (1)
        
        Riphean
        
        upper Riphean (1)
        
        Sturtian (5)
        
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        Chelmsford Formation (1)
        
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        Michigamme Formation (1)
        
        Orosirian (1)
        
        Whitewater Group (1)
        
        Wollaston Group (1)
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igneous rocks
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        zircon (451)
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Primary terms
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- Africa
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        Desmoinesian
        
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        Sakmarian (4)
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        Onaping Formation (1)
        
        Signal Hill Formation (1)
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        Blaini Formation (2)
        
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