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problematic fossils
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problematic microfossils (1)
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tracks (1)
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geochronology methods
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(U-Th)/He (5)
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Ar/Ar (36)
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exposure age (2)
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fission-track dating (3)
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infrared stimulated luminescence (1)
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K/Ar (3)
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Lu/Hf (5)
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Nd/Nd (1)
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optically stimulated luminescence (4)
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paleomagnetism (20)
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Pb/Pb (5)
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Pb/Th (1)
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radiation damage (3)
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Rb/Sr (1)
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Re/Os (9)
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Sm/Nd (7)
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tephrochronology (7)
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Th/U (1)
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thermochronology (3)
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tree rings (2)
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U/Pb (89)
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U/Th/Pb (7)
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uranium disequilibrium (1)
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geologic age
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Anthropocene (1)
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Cenozoic
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lower Cenozoic (1)
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Quaternary
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Cordilleran ice sheet (1)
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Holocene
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lower Holocene (3)
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Neoglacial
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Little Ice Age (1)
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upper Holocene
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Little Ice Age (1)
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Pleistocene
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Bandelier Tuff (1)
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Illinoian (2)
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upper Pleistocene
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Wisconsinan
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Lavery Till (1)
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middle Wisconsinan (1)
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upper Wisconsinan
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Fraser Glaciation (1)
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upper Quaternary (2)
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Saugus Formation (1)
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Tertiary
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Anahuac Formation (1)
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Catahoula Formation (1)
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Challis Volcanics (1)
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Cypress Hills Formation (1)
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Florissant Lake Beds (2)
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John Day Formation (1)
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lower Tertiary (2)
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Muddy Creek Formation (1)
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Neogene
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Hemphillian (1)
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Miocene
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Columbia River Basalt Group (2)
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middle Miocene (2)
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Peach Springs Tuff (2)
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Topopah Spring Member (1)
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upper Miocene
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Modelo Formation (1)
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Tortonian (1)
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Ogallala Formation (2)
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Pliocene
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lower Pliocene (3)
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Paleogene
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Duchesne River Formation (1)
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Eocene
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Bridger Formation (1)
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Chumstick Formation (1)
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Green River Formation (6)
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lower Eocene
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Ypresian
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London Clay (1)
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middle Eocene
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Claiborne Group (1)
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Cockfield Formation (1)
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Lutetian (1)
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Tyee Formation (1)
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Swauk Formation (1)
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upper Eocene
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Chadronian (1)
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Jackson Group (1)
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Moodys Branch Formation (1)
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Priabonian (1)
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Uinta Formation (2)
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Kenai Group (1)
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Oligocene
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Creede Formation (1)
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Fish Canyon Tuff (1)
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Frio Formation (2)
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Vicksburg Group (2)
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Paleocene
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lower Paleocene
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K-T boundary (6)
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Puercan (1)
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Ravenscrag Formation (1)
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Tongue River Member (1)
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Tullock Member (2)
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Wilcox Group (2)
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upper Cenozoic (3)
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Dalradian (1)
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Lake Bonneville (5)
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Laurentide ice sheet (3)
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Mesozoic
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Cretaceous
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Comanchean
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Trinity Group (2)
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Dakota Formation (1)
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Graneros Shale (1)
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Lower Cretaceous
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Albian
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upper Albian (2)
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Aptian (1)
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Blackleaf Formation (1)
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Bluesky Formation (1)
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Gething Formation (1)
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Mannville Group (1)
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McMurray Formation (1)
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Skull Creek Shale (1)
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Trinity Group (2)
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Middle Cretaceous (5)
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Toolebuc Formation (1)
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Upper Cretaceous
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Bearpaw Formation (1)
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Belly River Formation (2)
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Campanian
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Dinosaur Park Formation (6)
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upper Campanian (3)
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Cardium Formation (1)
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Cenomanian (3)
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Coniacian (1)
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Fruitland Formation (1)
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Gallup Sandstone (1)
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Gulfian
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Woodbine Formation (1)
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Hell Creek Formation (6)
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Horseshoe Canyon Formation (3)
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Javelina Formation (1)
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Judith River Formation (3)
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K-T boundary (6)
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Laramie Formation (1)
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Lewis Shale (2)
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Maestrichtian (2)
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Mesaverde Group (2)
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Middendorf Formation (1)
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Milk River Formation (1)
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Oldman Formation (2)
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Pictured Cliffs Sandstone (1)
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Pierre Shale (1)
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Prince Creek Formation (1)
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Saint Mary River Formation (1)
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Santonian (1)
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Senonian (3)
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Turonian (3)
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Tuscaloosa Formation (1)
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Two Medicine Formation (9)
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Williams Fork Formation (2)
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Franciscan Complex (1)
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Glen Canyon Group (1)
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Great Valley Sequence (1)
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Jurassic
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Lower Jurassic
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Talkeetna Formation (1)
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Norphlet Formation (1)
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San Rafael Group (1)
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Upper Jurassic
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Bowser Lake Group (1)
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Kimmeridgian
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upper Kimmeridgian (1)
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Morrison Formation (4)
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Salt Wash Sandstone Member (1)
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Smackover Formation (3)
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Stump Formation (1)
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Tithonian (1)
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lower Mesozoic (3)
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Orocopia Schist (1)
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Passaic Formation (2)
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Triassic
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Liard Formation (1)
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Lower Triassic
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Permian-Triassic boundary (1)
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Middle Triassic
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Doig Formation (1)
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Moenkopi Formation (1)
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Montney Formation (1)
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Nicola Group (1)
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Upper Triassic
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Chinle Formation (4)
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Lockatong Formation (2)
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Norian (1)
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Stuhini Group (1)
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Vaca Muerta Formation (1)
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MIS 2 (1)
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MIS 5 (2)
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Paleozoic
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Arbuckle Group (1)
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Bedford Shale (1)
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Berea Sandstone (2)
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Cambrian
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Acadian (1)
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Brigham Group (1)
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Lower Cambrian
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Gog Group (1)
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Middle Cambrian
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Flathead Sandstone (1)
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Metaline Limestone (1)
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Mount Read Volcanics (4)
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Upper Cambrian
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Pilgrim Formation (1)
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
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Barnett Shale (1)
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Chainman Shale (1)
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Lower Mississippian
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Kinderhookian
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Banff Formation (1)
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Osagian
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Burlington Limestone (1)
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Pocono Formation (1)
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Madison Group (1)
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Middle Mississippian (1)
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Sunbury Shale (1)
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Upper Mississippian
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Chesterian (1)
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Hinton Formation (1)
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Meramecian
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Salem Limestone (1)
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Valmeyeran (1)
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Pennsylvanian
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Conemaugh Group (1)
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Lower Pennsylvanian (1)
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Mary Lee Coal (2)
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Middle Pennsylvanian
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Allegheny Group (2)
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Atokan
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Atoka Formation (1)
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Desmoinesian (1)
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Monongahela Group (1)
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Morrow Formation (2)
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Pottsville Group (3)
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Smithwick Shale (1)
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Strawn Series (2)
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Upper Pennsylvanian
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Cisco Group (1)
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Missourian (1)
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Virgilian (1)
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Catskill Formation (1)
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Devonian
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Beaverhill Lake Group (3)
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Keg River Formation (1)
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Lower Devonian
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Oriskany Sandstone (3)
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Middle Devonian
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Elk Point Group (1)
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Givetian (2)
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Hamilton Group (2)
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Mahantango Formation (3)
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Marcellus Shale (4)
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Onondaga Limestone (3)
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Prairie Evaporite (1)
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Sulphur Point Formation (1)
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Old Red Sandstone (1)
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Slave Point Formation (1)
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Swan Hills Formation (5)
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Upper Devonian
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Brallier Shale (2)
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Famennian
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Wabamun Group (3)
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Frasnian
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Leduc Formation (4)
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upper Frasnian (1)
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Grosmont Formation (1)
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Jefferson Group (1)
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Nisku Formation (3)
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Ohio Shale (1)
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Olentangy Shale (1)
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Waterways Formation (1)
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Dunkard Group (1)
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Earn Group (1)
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Exshaw Formation (1)
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Helderberg Group (2)
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Keyser Limestone (1)
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lower Paleozoic
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Chopawamsic Formation (1)
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Wilmington Complex (1)
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Maroon Formation (1)
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New Albany Shale (1)
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Ordovician
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Ely Springs Dolomite (1)
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Lower Ordovician
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Ellenburger Group (1)
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Martinsburg Formation (1)
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Middle Ordovician
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Darriwilian (1)
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Upper Ordovician
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Fairview Formation (1)
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Juniata Formation (1)
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Red River Formation (1)
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Valmy Formation (1)
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Vinini Formation (1)
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Viola Limestone (1)
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Permian
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Blaine Formation (1)
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Cutler Formation (1)
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Guadalupian
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Brushy Canyon Formation (1)
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Lower Permian (2)
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Middle Permian (1)
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Rio Bonito Formation (1)
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Upper Permian
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Permian-Triassic boundary (1)
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Petersburg Granite (1)
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Shawangunk Formation (1)
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Silurian
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Lower Silurian
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Llandovery (2)
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Tuscarora Formation (4)
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Middle Silurian
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Clinton Group (1)
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McKenzie Formation (1)
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Upper Silurian
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Cayugan
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Tonoloway Limestone (1)
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Salina Group (1)
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Tensleep Sandstone (1)
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upper Paleozoic
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Bakken Formation (1)
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Wissahickon Formation (1)
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Phanerozoic (15)
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Precambrian
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Archean
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Blake River Group (3)
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Fig Tree Group (1)
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Mesoarchean (3)
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