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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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Bidahochi Formation (1)
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Miocene
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Aragonian (1)
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Columbia River Basalt Group (5)
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Ellensburg Formation (1)
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Grande Ronde Basalt (1)
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middle Miocene
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Langhian (1)
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Serravallian (1)
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-
Saddle Mountains Basalt (1)
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upper Miocene
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Messinian (2)
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Modelo Formation (1)
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Tortonian (1)
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Turolian (1)
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-
Vallesian (1)
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-
Ogallala Formation (1)
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Pliocene
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Gauss Chron (1)
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lower Pliocene
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Zanclean (1)
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-
upper Pliocene (2)
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Yorktown Formation (1)
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-
Ringold Formation (1)
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-
Paleogene
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Calvert Bluff Formation (1)
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Chadron Formation (1)
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Claron Formation (3)
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Duchesne River Formation (1)
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Eocene
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Bridger Formation (1)
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Chuckanut Formation (2)
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Chumstick Formation (1)
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Colton Formation (1)
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Green River Formation (3)
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Lake Uinta (1)
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lower Eocene
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Wasatchian (1)
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Willwood Formation (1)
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Ypresian (1)
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-
middle Eocene
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Carrizo Sand (1)
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Claiborne Group (2)
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Queen City Formation (1)
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Sparta Sand (1)
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-
Swauk Formation (1)
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upper Eocene
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Chadronian (3)
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Jackson Group (1)
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Uinta Formation (1)
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-
-
Hanna Formation (5)
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Kenai Group (1)
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Oligocene
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Brule Formation (2)
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Fish Canyon Tuff (1)
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upper Oligocene (1)
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-
Paleocene
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lower Paleocene
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K-T boundary (1)
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Puercan (1)
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Torrejonian (1)
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-
Nacimiento Formation (1)
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Tongue River Member (4)
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Tullock Member (1)
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upper Paleocene
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Tiffanian (3)
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-
-
Paleocene-Eocene Thermal Maximum (2)
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Wasatch Formation (3)
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White River Group (4)
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Wilcox Group (2)
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-
-
upper Cenozoic (3)
-
-
Laurentide ice sheet (2)
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Mesozoic
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Bisbee Group (1)
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Condrey Mountain Schist (2)
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Cretaceous
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Comanchean
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Buda Limestone (1)
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Fredericksburg Group (3)
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Glen Rose Formation (3)
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Washita Group (1)
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-
Dakota Formation (6)
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Lower Cretaceous
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Albian
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upper Albian (1)
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-
Aptian (1)
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Barremian (2)
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Bear River Formation (3)
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Burro Canyon Formation (6)
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Cedar Mountain Formation (7)
-
Cloverly Formation (3)
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Fredericksburg Group (3)
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Glen Rose Formation (3)
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Hauterivian (1)
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Inyan Kara Group (1)
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Lakota Formation (1)
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Mannville Group (1)
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McMurray Formation (1)
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Mowry Shale (4)
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Muddy Sandstone (2)
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Skull Creek Shale (1)
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-
Mancos Shale (5)
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Middle Cretaceous (7)
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Potomac Group (1)
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Upper Cretaceous
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Belle Fourche Shale (2)
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Belly River Formation (3)
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Blackhawk Formation (1)
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Bridge Creek Limestone Member (2)
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Buda Limestone (1)
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Campanian
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Dinosaur Park Formation (3)
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lower Campanian (2)
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upper Campanian (3)
-
-
Carlile Shale (3)
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Castlegate Sandstone (2)
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Cenomanian
-
Dunvegan Formation (1)
-
-
Codell Sandstone Member (1)
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Cody Shale (1)
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Eagle Sandstone (2)
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Ferron Sandstone Member (3)
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Fox Hills Formation (1)
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Frontier Formation (3)
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Fruitland Formation (7)
-
Greenhorn Limestone (4)
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Gulfian
-
Austin Group (1)
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Eagle Ford Formation (4)
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Taylor Marl (1)
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Woodbine Formation (3)
-
-
Hell Creek Formation (1)
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Horseshoe Canyon Formation (3)
-
Javelina Formation (1)
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Judith River Formation (3)
-
Kaiparowits Formation (4)
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K-T boundary (1)
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Lance Formation (1)
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Laramie Formation (1)
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Lewis Shale (1)
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Maestrichtian
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lower Maestrichtian (1)
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upper Maestrichtian (3)
-
-
Maevarano Formation (1)
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Marshalltown Formation (1)
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Mesaverde Group (2)
-
Milk River Formation (1)
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Moreno Formation (2)
-
Niobrara Formation (2)
-
Ojo Alamo Sandstone (1)
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Oldman Formation (2)
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Pictured Cliffs Sandstone (2)
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Pierre Shale (2)
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Prince Creek Formation (1)
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Ripley Formation (1)
-
Rosario Formation (1)
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Saint Mary River Formation (1)
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Santonian (1)
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Senonian (9)
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Star Point Sandstone (1)
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Straight Cliffs Formation (4)
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Tropic Shale (1)
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Turonian
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middle Turonian (1)
-
-
Two Medicine Formation (2)
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Wahweap Formation (3)
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Williams Fork Formation (1)
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-
-
Franciscan Complex (3)
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Glen Canyon Group (1)
-
Great Valley Sequence (5)
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Jurassic
-
Arapien Shale (2)
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Aztec Sandstone (1)
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Carmel Formation (3)
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Coast Range Ophiolite (1)
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Lower Jurassic
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Sunrise Formation (1)
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-
Middle Jurassic
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Summerville Formation (2)
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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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Brushy Basin Member (4)
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Entrada Sandstone (2)
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Galice Formation (1)
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Josephine Ophiolite (2)
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Kimmeridgian
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upper Kimmeridgian (1)
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-
Morrison Formation (15)
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Salt Wash Sandstone Member (1)
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Smackover Formation (2)
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Sundance Formation (2)
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Tithonian (1)
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-
-
lower Mesozoic (3)
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Moenave Formation (1)
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Navajo Sandstone (6)
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Passaic Formation (1)
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Triassic
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Lower Triassic
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Permian-Triassic boundary (1)
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Smithian (1)
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-
Moenkopi Formation (3)
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Upper Triassic
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Chinle Formation (3)
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Lockatong Formation (1)
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Luning Formation (1)
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Rhaetian (1)
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Shinarump Member (2)
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-
-
Yanshanian (1)
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-
MIS 2 (1)
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MIS 3 (1)
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Paleozoic
-
Bird Spring Formation (1)
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Cambrian
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Acadian (1)
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Lower Cambrian (2)
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Middle Cambrian (2)
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Upper Cambrian (1)
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-
Carboniferous
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Albert Formation (1)
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Big Snowy Group (2)
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Jackfork Group (2)
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Johns Valley Formation (1)
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Mississippian
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Borden Group (1)
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Charles Formation (2)
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Lower Mississippian
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Cuyahoga Formation (2)
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Joana Limestone (1)
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Lodgepole Formation (3)
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Osagian
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Burlington Limestone (1)
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Keokuk Limestone (1)
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-
Tournaisian (2)
-
-
Madison Group (5)
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Mission Canyon Limestone (4)
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Stanley Group (1)
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Upper Mississippian
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Chesterian (1)
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Heath Formation (1)
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Mauch Chunk Formation (1)
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Meramecian
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Salem Limestone (1)
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-
Serpukhovian (1)
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-
Valmeyeran (1)
-
-
Pennsylvanian
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Conemaugh Group (1)
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Hermosa Group (1)
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Lower Pennsylvanian (1)
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Middle Pennsylvanian
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Atokan
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Atoka Formation (1)
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-
-
Minturn Formation (1)
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Monongahela Group (1)
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Morrow Formation (1)
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Pittsburgh Coal (1)
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Pottsville Group (1)
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Upper Pennsylvanian
-
Ames Limestone (1)
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Glenshaw Formation (1)
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Virgilian
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Lecompton Limestone (1)
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Oread Limestone (1)
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-
-
Watahomigi Formation (1)
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-
-
Catskill Formation (1)
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Deadwood Formation (1)
-
Devonian
-
Guilmette Formation (1)
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Lower Devonian
-
Coeymans Formation (1)
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Emsian (2)
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Lochkovian (2)
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Manlius Formation (1)
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Pragian (1)
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Shap Granite (1)
-
-
Middle Devonian
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Givetian (1)
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Prairie Evaporite (1)
-
-
Slave Point Formation (1)
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Swan Hills Formation (1)
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Traverse Group (1)
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Upper Devonian
-
Duperow Formation (3)
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Famennian
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Wabamun Group (1)
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-
Frasnian
-
Leduc Formation (1)
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upper Frasnian (1)
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-
Jefferson Group (2)
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Nisku Formation (1)
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Palliser Formation (1)
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-
-
Dunkard Group (1)
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Hartland Formation (1)
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Keyser Limestone (1)
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lower Paleozoic
-
Chopawamsic Formation (1)
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Conococheague Formation (1)
-
-
Maroon Formation (1)
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middle Paleozoic
-
Hillabee Chlorite Schist (1)
-
-
Minnelusa Formation (2)
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New Albany Shale (1)
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Ordovician
-
Lexington Limestone (1)
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Middle Ordovician
-
Winnipeg Formation (1)
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-
Upper Ordovician
-
Caradocian
-
Borrowdale Volcanic Group (1)
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-
Cincinnatian
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Richmondian (1)
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-
Katian (1)
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Red River Formation (5)
-
-
-
Permian
-
Blaine Formation (1)
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Cutler Formation (2)
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Guadalupian
-
Brushy Canyon Formation (1)
-
-
Khuff Formation (1)
-
Lower Permian
-
Cisuralian
-
Artinskian (1)
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Kungurian (2)
-
-
Leonardian (1)
-
Opeche Shale (1)
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Wolfcampian (1)
-
-
Lyons Sandstone (2)
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Middle Permian (3)
-
Rotliegendes (1)
-
Rustler Formation (1)
-
Shihezi Formation (1)
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Upper Permian
-
Lopingian (1)
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Permian-Triassic boundary (1)
-
Salado Formation (1)
-
-
Wellington Formation (1)
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Yates Formation (1)
-
-
Silurian
-
Upper Silurian
-
Pridoli (1)
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-
-
Supai Formation (3)
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Talladega Group (1)
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upper Paleozoic
-
Antrim Shale (1)
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Bakken Formation (8)
-
-
Weber Sandstone (1)
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-
Phanerozoic (5)
-
Precambrian
-