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geologic age
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Cenozoic
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lower Cenozoic (3)
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Quaternary
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Holocene (2)
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Pleistocene
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middle Pleistocene
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Elsterian (1)
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upper Pleistocene (3)
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upper Quaternary (2)
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Saugus Formation (1)
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Tertiary
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Esna Shale (1)
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lower Tertiary (6)
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Muddy Creek Formation (1)
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Neogene
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Miocene
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Columbia River Basalt Group (2)
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Guantao Formation (2)
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lower Miocene (8)
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middle Miocene
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Serravallian (1)
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upper Miocene
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Messinian (6)
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Modelo Formation (1)
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Mount Messenger Formation (1)
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Tortonian (1)
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Pliocene
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lower Pliocene (1)
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upper Pliocene (1)
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upper Neogene (1)
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Paleogene
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Dongying Formation (3)
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Eocene
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Colton Formation (1)
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Green River Formation (9)
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lower Eocene
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Thebes Formation (2)
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Ypresian (3)
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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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Yegua Formation (3)
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upper Eocene
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Cowlitz Formation (1)
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Jackson Group (1)
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Flagstaff Formation (1)
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Kapuni Group (1)
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Kenai Group (1)
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lower Paleogene (1)
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Oligocene
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Frio Formation (11)
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Hackberry Formation (2)
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middle Oligocene (4)
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upper Oligocene (3)
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Vicksburg Group (4)
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Paleocene
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lower Paleocene
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Danian (2)
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K-T boundary (3)
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Tongue River Member (1)
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upper Paleocene (1)
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Paleocene-Eocene Thermal Maximum (2)
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Tyonek Formation (2)
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Wasatch Formation (9)
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Wilcox Group (11)
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Shahejie Formation (4)
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upper Tertiary (2)
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upper Cenozoic (1)
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Coal Measures (3)
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Mesozoic
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Cretaceous
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Asu River Group (1)
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Bahariya Formation (2)
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Chonta Formation (1)
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Colorado Group (6)
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Comanchean
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Paluxy Formation (2)
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Pearsall Formation (1)
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Rodessa Formation (2)
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Travis Peak Formation (3)
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Dakota Formation (5)
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Graneros Shale (2)
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Judea Group (1)
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Logan Canyon Formation (1)
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Lower Cretaceous
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Albian
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upper Albian (1)
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Aptian
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Shuaiba Formation (1)
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Barremian (2)
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Berriasian (1)
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Blackleaf Formation (1)
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Bluesky Formation (3)
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Cadomin Formation (3)
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Candeias Formation (1)
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Clearwater Formation (1)
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Gething Formation (5)
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Hosston Formation (2)
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Isachsen Formation (1)
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Mannville Group (7)
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McMurray Formation (4)
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Missisauga Formation (2)
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Moosebar Formation (3)
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Mowry Shale (3)
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Muddy Sandstone (3)
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Neocomian (2)
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Paluxy Formation (2)
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Pearsall Formation (1)
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Rodessa Formation (2)
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Skull Creek Shale (1)
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Sligo Formation (1)
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Spirit River Formation (7)
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Thamama Group (1)
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Travis Peak Formation (3)
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Mancos Shale (5)
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Middle Cretaceous (2)
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Nanushuk Group (1)
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Upper Cretaceous
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Almond Formation (4)
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Belle Fourche Shale (4)
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Belly River Formation (6)
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Blackhawk Formation (2)
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Campanian
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Dinosaur Park Formation (1)
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Cardium Formation (5)
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Carlile Shale (5)
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Cenomanian (8)
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Codell Sandstone Member (1)
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Cody Shale (1)
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Coniacian (2)
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Duwi Formation (1)
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Eagle Sandstone (5)
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Eutaw Formation (1)
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Ferron Sandstone Member (1)
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Frontier Formation (3)
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Fruitland Formation (6)
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Greenhorn Limestone (5)
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Gulfian
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Austin Chalk (2)
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Austin Group (3)
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Eagle Ford Formation (10)
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Woodbine Formation (1)
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Honna Formation (1)
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Horseshoe Canyon Formation (2)
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Judith River Formation (2)
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K-T boundary (3)
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La Luna Formation (1)
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Lance Formation (5)
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Lewis Shale (5)
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Maestrichtian (5)
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Mesaverde Group (18)
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Milk River Formation (4)
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Moreno Formation (1)
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Niobrara Formation (4)
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Oldman Formation (1)
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Pictured Cliffs Sandstone (2)
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Pierre Shale (5)
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Santonian (6)
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Senonian (10)
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Smoky Hill Chalk Member (1)
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Turonian (8)
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Tuscaloosa Formation (3)
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Vivian Formation (1)
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Williams Fork Formation (8)
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Wyandot Formation (1)
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Viking Formation (2)
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Great Valley Sequence (2)
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Jurassic
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Bazhenov Formation (1)
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Fernie Formation (1)
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Heather Formation (2)
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Kingak Shale (1)
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Lower Jurassic
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Hettangian (1)
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lower Liassic (3)
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Nordegg Member (1)
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Sinemurian (1)
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Toarcian
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lower Toarcian (1)
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upper Liassic (2)
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Middle Jurassic
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Aalenian (1)
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Bajocian
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Brent Group (5)
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Etive Formation (1)
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Ness Formation (1)
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Rannoch Formation (2)
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Bathonian (1)
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Callovian (2)
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Summerville Formation (1)
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Walloon Coal Measures (3)
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Xishanyao Formation (1)
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Norphlet Formation (7)
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Posidonia Shale (1)
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Upper Jurassic
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Arab Formation (1)
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Bossier Formation (4)
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Buckner Formation (2)
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Cotton Valley Group (8)
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Fulmar Formation (1)
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Haynesville Formation (14)
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Kimmeridge Clay (4)
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Kimmeridgian (4)
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Morrison Formation (1)
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Oxfordian (2)
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Portlandian (1)
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Schuler Formation (1)
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Smackover Formation (14)
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Tithonian (2)
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Volgian (1)
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Kayenta Formation (1)
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Kunga Group (2)
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middle Mesozoic (1)
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Murihiku Supergroup (1)
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Navajo Sandstone (1)
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Nugget Sandstone (1)
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Sandilands Formation (1)
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Statfjord Formation (1)
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Triassic
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Charlie Lake Formation (5)
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Lower Triassic
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Bunter (1)
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Dinwoody Formation (1)
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Middle Triassic
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Doig Formation (5)
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Muschelkalk (1)
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Montney Formation (6)
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Sherwood Sandstone (2)
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Shublik Formation (4)
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Upper Triassic
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Baldonnel Formation (3)
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Mercia Mudstone (1)
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Pardonet Formation (2)
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Rhaetian (1)
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Sag River Sandstone (1)
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Xujiahe Formation (2)
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Yanchang Formation (3)
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upper Mesozoic (1)
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Vaca Muerta Formation (1)
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Yanshanian (1)
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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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Lower Cambrian (2)
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Upper Cambrian
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Furongian (1)
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Carboniferous
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Albert Formation (1)
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Amsden Formation (1)
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Benxi Formation (1)
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Jackfork Group (1)
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Lower Carboniferous
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Dinantian (2)
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Mabou Group (1)
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Middle Carboniferous (1)
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Mississippian
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Barnett Shale (27)
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Boone Formation (1)
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Lower Mississippian
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Kekiktuk Conglomerate (1)
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Lodgepole Formation (1)
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Osagian
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Burlington Limestone (1)
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Madison Group (5)
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Middle Mississippian (1)
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Mission Canyon Limestone (3)
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Sunbury Shale (1)
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Upper Mississippian
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Chesterian (1)
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Fayetteville Formation (1)
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Hartselle Sandstone (1)
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Heath Formation (1)
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Hinton Formation (1)
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Mauch Chunk Formation (1)
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Windsor Group (1)
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Pennsylvanian
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Cumberland Group (1)
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Lower Pennsylvanian
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Morrowan (2)
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Mary Lee Coal (2)
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Middle Pennsylvanian
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Allegheny Group (1)
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Atokan
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Atoka Formation (3)
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Breathitt Formation (1)
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Desmoinesian
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Cherokee Group (2)
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Hartshorne Sandstone (1)
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Marmaton Group (1)
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Spiro Sandstone (2)
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Kanawha Formation (1)
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Morrow Formation (7)
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Pottsville Group (2)
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Red Fork Sandstone (1)
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Strawn Series (2)
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Upper Pennsylvanian
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Canyon Group (1)
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Cisco Group (1)
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Missourian (1)
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Virgilian
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Tonganoxie Sandstone (1)
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Wapanucka Limestone (1)
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Silesian (1)
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Springer Formation (1)
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Upper Carboniferous
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Westphalian (6)
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Catskill Formation (1)
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Chattanooga Shale (1)
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Devonian
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Beaverhill Lake Group (1)
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Keg River Formation (4)
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Lower Devonian
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Oriskany Sandstone (4)
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Middle Devonian
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Elk Point Group (1)
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Marcellus Shale (21)
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Nahanni Formation (2)
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Onondaga Limestone (5)
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Sulphur Point Formation (2)
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Tully Limestone (1)
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Winnipegosis Formation (1)
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Millboro Shale (1)
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Slave Point Formation (4)
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Swan Hills Formation (3)
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Upper Devonian
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Canadaway Group (1)
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Chemung Formation (1)
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Cleveland Member (1)
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Duperow Formation (1)
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Famennian
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Wabamun Group (4)
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Frasnian
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Leduc Formation (4)
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Huron Member (1)
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Jefferson Group (1)
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Nisku Formation (4)
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Ohio Shale (2)
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Waterways Formation (1)
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Exshaw Formation (1)
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Helderberg Group (1)
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Horton Group (1)
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Hunton Group (2)
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Itarare Subgroup (2)
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Knox Group (3)
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Lisburne Group (3)
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lower Paleozoic
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Rose Run Sandstone (3)
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Minnelusa Formation (3)
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New Albany Shale (3)
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Ordovician
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Lower Ordovician
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Beekmantown Group (4)
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Ellenburger Group (4)
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Prairie du Chien Group (2)
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Martinsburg Formation (1)
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Middle Ordovician
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Black River Group (5)
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Glenwood Shale (1)
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Saint Peter Sandstone (1)
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Trenton Group (7)
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Upper Ordovician
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Bighorn Dolomite (1)
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Cincinnatian
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