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geochronology methods
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geologic age
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        upper Miocene (4)
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        Rexroad Formation (1)
    - Paleogene
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        lower Eocene (2)
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        lower Paleocene
        
        K-T boundary (1)
        
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- Mesozoic
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    - Lower Cretaceous
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      - Gulfian
        
        Austin Chalk (3)
        
        Austin Group (3)
        
        Eagle Ford Formation (3)
        
        Taylor Marl (1)
        
        Woodbine Formation (1)
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  - Jurassic
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  - Triassic
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- Paleozoic
  - Arbuckle Group (33)
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  - Carboniferous
    - Bartlesville Sand (6)
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    - Jackfork Group (12)
    - Johns Valley Formation (7)
    - Lower Carboniferous
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      - Lower Mississippian
        
        Chappel Limestone (2)
        
        Lodgepole Formation (2)
        
        Osagian
        
        Burlington Limestone (1)
        
        Keokuk Limestone (1)
      - Middle Mississippian
        
        Visean (1)
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      - Stanley Group (17)
      - Upper Mississippian
        
        Chesterian
        
        Imo Formation (7)
        
        Renault Formation (1)
        
        Fayetteville Formation (14)
        
        Greenbrier Limestone (1)
        
        Hartselle Sandstone (1)
        
        Heath Formation (1)
        
        Meramecian
        
        Saint Louis Limestone (1)
        
        Parkwood Formation (2)
        
        Pitkin Limestone (3)
        
        Pride Mountain Formation (1)
      - Windsor Group (1)
    - Namurian (1)
    - Pennsylvanian
      - Excello Shale (1)
      - Lower Pennsylvanian
        
        Bashkirian (1)
        
        Haymond Formation (2)
        
        Morrowan
        
        Bloyd Formation (4)
      - Marble Falls Group (1)
      - Middle Pennsylvanian
        
        Atokan
        
        Atoka Formation (19)
        
        Breathitt Formation (1)
        
        Desmoinesian
        
        Boggy Shale (3)
        
        Cherokee Group (10)
        
        Hartshorne Sandstone (3)
        
        Krebs Group (2)
        
        Labette Shale (1)
        
        Marmaton Group (2)
        
        Spiro Sandstone (3)
        
        Wewoka Formation (4)
        
        Kewanee Group (1)
        
        Moscovian (1)
      - Morrow Formation (16)
      - Red Fork Sandstone (12)
      - Strawn Series (2)
      - Upper Pennsylvanian
        
        Canyon Group (5)
        
        Cisco Group (4)
        
        Kasimovian (1)
        
        Missourian
        
        Kansas City Group (3)
        
        Lansing Group (1)
        
        Plattsburg Limestone (1)
        
        Seminole Formation (1)
        
        Stanton Formation (1)
        
        Wann Formation (3)
        
        Virgilian
        
        Douglas Group (1)
        
        Shawnee Group (1)
        
        Wabaunsee Group (1)
      - Wapanucka Limestone (5)
      - Westerly Granite (1)
    - Springer Formation (7)
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    - Upper Carboniferous
      - Westphalian (4)
  - Chattanooga Shale (3)
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  - Devonian
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      - Marcellus Shale (2)
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      - Duperow Formation (1)
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  - Hunton Group (25)
  - lower Paleozoic
    - Cape Phillips Formation (2)
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  - Ordovician
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    - Lower Ordovician
      - Beekmantown Group (1)
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      - Kindblade Formation (5)
    - Middle Ordovician
      - Bigfork Chert (1)
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      - Bromide Formation (30)
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      - Platteville Formation (1)
      - Simpson Group (20)
      - Whiterockian (1)
    - Montoya Group (1)
    - Upper Ordovician
      - Caradocian (1)
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        Richmondian (2)
      - Fernvale Formation (3)
      - Katian (2)
      - Sandbian (3)
    - Viola Limestone (16)
    - Womble Shale (2)
  - Permian
    - Americus Limestone Member (1)
    - Blaine Formation (8)
    - Chase Group (3)
    - Cottonwood Limestone (2)
    - Council Grove Group (2)
    - Cutler Formation (1)
    - Fort Riley Limestone (2)
    - Guadalupian
      - Brushy Canyon Formation (1)
      - Cherry Canyon Formation (1)
      - Grayburg Formation (1)
      - Queen Formation (1)
      - Roadian (2)
      - Seven Rivers Formation (3)
      - Tansill Formation (3)
      - Wordian (3)
    - Hennessey Formation (9)
    - Hutchinson Salt Member (1)
    - Lower Permian
      - Cherry Canyon Formation (1)
      - Cisuralian
        
        Artinskian (1)
        
        Asselian (1)
        
        Kungurian (3)
      - Leonardian
        
        Clear Fork Group (10)
      - Wichita Group (8)
      - Wolfcampian (9)
    - Middle Permian (9)
    - Stone Corral Formation (2)
    - Upper Permian
      - Kazanian (2)
      - Lopingian (1)
      - Permian-Triassic boundary (1)
      - Salado Formation (2)
      - Tatarian (2)
    - Wellington Formation (12)
    - Yates Formation (1)
  - Silurian
    - Henryhouse Formation (10)
    - Lockport Formation (1)
    - Lower Silurian
      - Llandovery
        
        Rhuddanian (1)
      - Tuscarora Formation (1)
    - Middle Silurian
      - Roberts Mountains Formation (1)
      - Waldron Shale (2)
    - Niagaran (1)
    - Upper Silurian
      - Ludlow (3)
      - Pridoli (1)
  - upper Paleozoic
    - Admire Group (1)
    - Antrim Shale (1)
    - Arkansas Novaculite (4)
    - Bakken Formation (3)
  - Woodford Shale (56)
- Phanerozoic (3)
- Precambrian
  - Eocambrian (2)
  - Stillwater Complex (1)
  - upper Precambrian
    - Proterozoic
      - Mesoproterozoic
        
        Fordham Gneiss (1)
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        Ediacaran (1)
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igneous rocks
- igneous rocks
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  - volcanic rocks
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- volcanic ash (4)
metamorphic rocks
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- metamorphic rocks
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- turbidite (15)
meteorites
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        EH chondrites
        
        Abee Meteorite (1)
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        L chondrites (1)
minerals
- carbonates
  - ankerite (3)
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  - calcite (16)
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- halides
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- K-bentonite (1)
- minerals (12)
- oxides
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  - hydroxides
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- phosphates
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- silicates
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      - clinoamphibole
        
        richterite (1)
        
        riebeckite (1)
    - pyroxene group (1)
  - framework silicates
    - feldspar group
      - alkali feldspar
        
        adularia (2)
        
        anorthoclase (1)
        
        K-feldspar (2)
      - plagioclase
        
        bytownite (1)
    - silica minerals
      - opal
        
        opal-A (1)
        
        opal-CT (1)
      - quartz (16)
    - zeolite group (2)
  - orthosilicates
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        titanite (1)
      - zircon group
        
        zircon (13)
  - ring silicates
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    - chlorite group
      - chamosite (1)
      - chlorite (8)
    - clay minerals
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      - smectite (5)
    - illite (11)
    - mica group
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    - pyrophyllite (1)
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- sulfates
  - anhydrite (7)
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- sulfides
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- sulfosalts
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    - enargite (1)
Primary terms
- absolute age (30)
- Africa
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  - Far East
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- atmosphere (2)
- Australasia
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- bibliography (6)
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- Canada
  - Eastern Canada
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- carbon
  - C-13/C-12 (36)
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- Caribbean region (1)
- catalogs (6)
- Cenozoic
  - Blancan (1)
  - Quaternary
    - Clovis (2)
    - Holocene
      - middle Holocene (1)
      - upper Holocene (1)
    - lower Quaternary (1)
    - Pleistocene
      - Blackwater Draw Formation (4)
      - lower Pleistocene (1)
      - Pearlette Volcanic Ash (1)
      - upper Pleistocene
        
        Wisconsinan (1)
    - upper Quaternary (1)
  - Tertiary
    - lower Tertiary (1)
    - Neogene
      - Capistrano Formation (1)
      - Hemphillian (4)
      - Miocene
        
        upper Miocene (4)
      - Ogallala Formation (11)
      - Pliocene
        
        lower Pliocene (1)
        
        upper Pliocene
        
        Rexroad Formation (1)
    - Paleogene
      - Eocene
        
        lower Eocene (2)
      - Oligocene (1)
      - Paleocene
        
        lower Paleocene
        
        K-T boundary (1)
        
        upper Paleocene (1)
      - Wilcox Group (1)
  - upper Cenozoic (2)
- Central America
  - Guatemala (1)
  - Panama (1)
- chemical analysis (3)
- Chordata
  - Vertebrata
    - Agnatha (1)
    - Pisces
      - Acanthodii
        
        Acanthodes (1)
      - Chondrichthyes
        
        Elasmobranchii (4)
      - Osteichthyes
        
        Actinopterygii
        
        Chondrostei
        
        Palaeonisciformes (1)
        
        Sarcopterygii
        
        Dipnoi (2)
    - Tetrapoda
      - Amniota (4)
      - Amphibia
        
        Labyrinthodontia
        
        Temnospondyli (8)
        
        Lepospondyli (4)
      - Mammalia
        
        Theria
        
        Eutheria
        
        Artiodactyla
        
        Ruminantia
        
        Bovidae
        
        Bison
        
        Bison occidentalis (1)
        
        Tylopoda
        
        Camelidae (2)
        
        Carnivora
        
        Fissipeda
        
        Mustelidae (1)
        
        Condylarthra (1)
        
        Proboscidea
        
        Elephantoidea
        
        Elephantidae
        
        Mammuthus
        
        Mammuthus columbi (1)
        
        Rodentia
        
        Sciuromorpha
        
        Sciuridae (1)
        
        Ungulata (1)
      - Reptilia
        
        Anapsida
        
        Cotylosauria
        
        Captorhinomorpha