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Apache County Arizona (1)
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Coconino County Arizona (2)
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La Paz County Arizona (1)
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Mohave County Arizona (1)
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Navajo County Arizona
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Petrified Forest National Park (5)
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Yavapai County Arizona (2)
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Arkansas
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California
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Caliente Range (1)
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Feather River (1)
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Glenn County California (2)
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Inyo County California
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Owens Lake (2)
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Panamint Range (1)
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Kern County California
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Elk Hills Field (1)
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Lassen Volcanic National Park (1)
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Los Angeles County California
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Puente Hills (1)
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Madera County California (1)
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Mammoth Mountain (5)
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Mariposa County California (1)
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Mendocino County California (2)
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Modoc County California (1)
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Mono County California
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Long Valley Caldera (5)
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Northern California (10)
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Rattlesnake Creek Terrane (6)
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Riverside County California (1)
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San Bernardino County California (5)
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San Luis Obispo County California
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Shasta County California
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Lassen Peak (2)
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Sierra Nevada Batholith (3)
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Siskiyou County California (1)
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Yolla Bolly Terrane (3)
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Colorado
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Routt County Colorado (1)
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Teller County Colorado (1)
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Colorado Plateau (14)
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Connecticut
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Delaware Basin (6)
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Eastern U.S.
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Florida (3)
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Hawaii
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Hawaii County Hawaii
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Hawaii Island
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Idaho
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Custer County Idaho
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Borah Peak (2)
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Lemhi County Idaho
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Lost River Range
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Nez Perce County Idaho (2)
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Seven Devils Mountains (2)
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Snake River plain (10)
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Idaho Batholith (7)
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Illinois (1)
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Iowa (1)
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Kansas
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Kentucky
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Louisiana (5)
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Massachusetts
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Merrimack Synclinorium (1)
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Michigan (3)
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Minnesota
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Mississippi (2)
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Missouri
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New Madrid County Missouri
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Montana
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Nebraska
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Nevada
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New England (1)
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New Mexico
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Datil-Mogollon volcanic field (1)
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Eddy County New Mexico
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Waste Isolation Pilot Plant (1)
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New York
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Adirondack Mountains (1)
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Cattaraugus County New York (1)
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Finger Lakes (1)
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Jefferson County New York (1)
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Livingston County New York (1)
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Saint Lawrence County New York (1)
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North Carolina
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North Dakota (4)
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Ohio (4)
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Oklahoma
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Arbuckle Anticline (1)
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Criner Hills (1)
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Kiowa County Oklahoma (1)
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Le Flore County Oklahoma (2)
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Osage County Oklahoma (1)
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Pawnee County Oklahoma (1)
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Oregon
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Baker County Oregon (4)
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Coos County Oregon
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Grant County Oregon (3)
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Orogrande Basin (1)
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Pennsylvania
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Texas
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Balcones fault zone (3)
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Llano Uplift (3)
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West Texas (12)
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Trans-Pecos (2)
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U. S. Rocky Mountains
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Utah
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Vermont (1)
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Washington
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West Virginia
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Western U.S. (11)
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Wisconsin
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Sauk County Wisconsin
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Baraboo Wisconsin (3)
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Wolf River Batholith (1)
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Wyoming
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commodities
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mineral deposits, genesis (27)
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placers (2)
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elements, isotopes
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carbon
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C-13/C-12 (29)
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chemical ratios (4)
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halogens
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chlorine
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Cl-36 (3)
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hydrogen
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incompatible elements (1)
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isotope ratios (93)
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isotopes
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Al-26 (4)
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stable isotopes
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C-13/C-12 (29)
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deuterium (1)
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Hf-177/Hf-176 (9)
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O-17/O-16 (2)
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O-18/O-16 (35)
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Pb-206/Pb-204 (16)
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Rb-87/Sr-86 (4)
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Lu/Hf (5)
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metals
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Rb-87/Sr-86 (4)
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Sr-87/Sr-86 (27)
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aluminum
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Al-26 (4)
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arsenic (1)
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copper (2)
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hafnium
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Hf-177/Hf-176 (9)
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iron (5)
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lead
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Pb-206/Pb-204 (16)
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Pb-207/Pb-204 (11)
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Nd-144/Nd-143 (27)
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Tetrapoda
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Mammalia
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Reptilia
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Lepidosauria
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Squamata
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Ostracoda
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Podocopida
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Bairdiomorpha
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Bairdiacea
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Bairdiidae
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Bairdia (1)
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Cypridocopina
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Cyprididae
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Candona (1)
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Trilobitomorpha
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Trilobita (2)
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Brachiopoda
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Articulata
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Rhynchonellida (1)
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Spiriferida
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Atrypidae
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Atrypa (1)
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Cyrtospirifer (1)
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Spiriferidina
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Spiriferidae (1)
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Bryozoa (2)
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Cnidaria
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Anthozoa
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Zoantharia
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Scleractinia (1)
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Echinodermata
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Crinozoa
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Blastoidea (1)
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Crinoidea (4)
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Echinozoa
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Edrioasteroidea (1)
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Mollusca
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Bivalvia
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Heterodonta
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Rudistae (2)
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Pterioida
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Pteriina
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Inocerami
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Inoceramidae
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Inoceramus (1)
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Cephalopoda
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Ammonoidea
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Ammonites (3)
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Gastropoda
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Neogastropoda (1)
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Pulmonata (1)
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Porifera (2)
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Protista
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Foraminifera
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Fusulinina
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Fusulinidae (2)
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Miliolina (1)
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Textulariina
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Lituolacea
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Orbitolinidae (1)
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Radiolaria (5)
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Vermes
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Polychaeta
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Serpulidae (1)
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microfossils
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Charophyta (2)
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Conodonta (7)
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Fusulinina
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Fusulinidae (2)
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palynomorphs
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acritarchs (2)
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Dinoflagellata (6)
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miospores
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pollen (8)
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Plantae
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algae
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Chlorophyta
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Charophyta (2)
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Bryophyta (1)
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Pteridophyta
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Sphenopsida
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Equisetales (1)
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Spermatophyta
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Angiospermae (1)
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Gymnospermae
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Coniferales
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Taxodium (1)
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Cordaitales (1)
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Cycadales (1)
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Ginkgoales (1)
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Pteridospermae (1)
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thallophytes (1)
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tracks (2)
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geochronology methods
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(U-Th)/He (5)
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Ar/Ar (32)
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exposure age (12)
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infrared stimulated luminescence (1)
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K/Ar (9)
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Lu/Hf (5)
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optically stimulated luminescence (9)
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paleomagnetism (17)
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Pb/Pb (2)
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racemization (1)
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Rb/Sr (5)
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Re/Os (1)
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Sm/Nd (6)
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Sr/Sr (1)
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tephrochronology (5)
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Th/U (3)
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thermochronology (9)
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tree rings (1)
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U/Pb (89)
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U/Th/Pb (3)
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uranium disequilibrium (4)
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geologic age
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Anthropocene (1)
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Cenozoic
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Glenns Ferry Formation (1)
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middle Cenozoic (1)
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Quaternary
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Cordilleran ice sheet (2)
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Holocene
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lower Holocene (2)
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Medieval Warm Period (1)
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middle Holocene (2)
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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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Bishop Tuff (3)
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Champlain Sea (1)
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Lake Agassiz (3)
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Lake Missoula (6)
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lower Pleistocene (2)
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middle Pleistocene
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Elsterian (1)
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Peoria Loess (2)
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upper Pleistocene
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Devensian
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upper Devensian (1)
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Lake Iroquois (1)
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Weichselian
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upper Weichselian
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Allerod (2)
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Bolling (2)
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Younger Dryas (2)
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Wisconsinan
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upper Wisconsinan (7)
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upper Quaternary (12)
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Saugus Formation (1)
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Stone Age
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Paleolithic (1)
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Tertiary
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Arikaree Group (1)
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Asmari Formation (1)
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Challis Volcanics (2)
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Neogene
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Bidahochi Formation (1)
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Hemphillian (3)
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Miocene
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Ash Hollow Formation (1)
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Clarendonian (1)
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Columbia River Basalt Group (20)
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Grande Ronde Basalt (4)
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lower Miocene (3)
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middle Miocene (5)
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Saddle Mountains Basalt (3)
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upper Miocene
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Modelo Formation (1)
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Puente Formation (1)
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Punchbowl Formation (1)
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Valentine Formation (1)
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Wanapum Basalt (2)
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Ogallala Formation (2)
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Pliocene (24)
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Ringold Formation (1)
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upper Neogene (1)
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Paleogene
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Calvert Bluff Formation (1)
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Duchesne River Formation (2)
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Eocene
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Absaroka Supergroup (1)
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Bridger Formation (1)
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Chuckanut Formation (2)
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Chumstick Formation (6)
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Crescent Formation (2)
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Green River Formation (6)
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Lake Gosiute (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 (6)
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upper Eocene
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Jackson Group (1)
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Tejon Formation (1)
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Uinta Formation (2)
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Hanna Formation (3)
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Oligocene
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Frio Formation (1)
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lower Oligocene
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Rupelian (1)
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middle Oligocene (2)
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upper Oligocene (3)
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Vicksburg Group (1)
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Paleocene
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middle Paleocene
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Selandian (1)
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upper Paleocene
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Thanetian (1)
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Paleocene-Eocene Thermal Maximum (2)
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Refugian (1)
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Renova Formation (1)
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Sespe Formation (2)
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White River Group (3)
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Wilcox Group (2)
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upper Cenozoic (4)
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Lake Bonneville (3)
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Laurentide ice sheet (4)
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Mesozoic
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Condrey Mountain Schist (3)
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Cretaceous
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Blairmore Group (1)
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Comanchean
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Buda Limestone (1)
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Comanche Peak Limestone (1)
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Edwards Formation (2)
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Fredericksburg Group (3)
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Georgetown Formation (1)
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Glen Rose Formation (2)
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Pearsall Formation (2)
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Washita Group (2)
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Dakota Formation (1)
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Kuskokwim Group (2)
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Lower Cretaceous
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Albian
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upper Albian (2)
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Aptian
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Shuaiba Formation (1)
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Barremian (2)
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Blake-Bahama Formation (1)
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Cedar Mountain Formation (1)
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Christopher Formation (1)
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Cloverly Formation (1)
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Comanche Peak Limestone (1)
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Cupido Formation (1)
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Edwards Formation (2)
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Fredericksburg Group (3)
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Georgetown Formation (1)
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Glen Rose Formation (2)
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Hauterivian (1)
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Hosston Formation (1)
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Isachsen Formation (1)
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Mannville Group (5)
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Muddy Sandstone (1)
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Pearsall Formation (2)
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Skull Creek Shale (1)
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Sligo Formation (1)
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Valanginian (1)
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Mancos Shale (4)
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Middle Cretaceous (6)
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Natih Formation (1)
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Upper Cretaceous
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Belly River Formation (4)
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Blackhawk Formation (1)
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Buda Limestone (1)
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Campanian
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Dinosaur Park Formation (2)
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upper Campanian (1)
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Castlegate Sandstone (1)
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Cenomanian (9)
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Coniacian (1)
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Djadokhta Formation (1)
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Ferron Sandstone Member (1)
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Gulfian
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Austin Chalk (3)
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Austin Group (1)
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Eagle Ford Formation (7)
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Horseshoe Canyon Formation (3)
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Judith River Formation (1)
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Kanguk Formation (1)
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Maestrichtian
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lower Maestrichtian (2)
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upper Maestrichtian (1)
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Niobrara Formation (1)
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Oldman Formation (5)
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Saint Mary River Formation (2)
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Senonian (3)
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Star Point Sandstone (1)
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Turonian (7)
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Tuscaloosa Formation (1)
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Two Medicine Formation (2)
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Franciscan Complex (3)
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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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Arapien Shale (1)
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Bonanza Group (1)
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Carmel Formation (3)
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Coast Range Ophiolite (1)
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Ferrar Group (1)
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Heather Formation (1)
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Ladner Group (1)
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Lower Jurassic
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Dunlin Group (1)
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Middle Jurassic
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Bajocian
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Brent Group (1)
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Broom Formation (1)
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Etive Formation (1)
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Ness Formation (1)
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Rannoch Formation (1)
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Tarbert Formation (1)
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Bathonian (2)
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Callovian (1)
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Norphlet Formation (1)
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San Rafael Group (1)
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Smartville Complex (1)
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Twin Creek Limestone (1)
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Upper Jurassic
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Bowser Lake Group (3)
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Cotton Valley Group (1)
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Entrada Sandstone (1)
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Galice Formation (9)
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Josephine Ophiolite (8)
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Kimmeridgian (2)
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Morrison Formation (2)
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Oxfordian (3)
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Portlandian (1)
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Smackover Formation (1)
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Stump Formation (1)
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Sundance Formation (5)
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Swift Formation (1)
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Tithonian (2)
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lower Mesozoic (1)
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Statfjord Formation (1)
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Triassic
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Lower Triassic
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Dinwoody Formation (1)
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Middle Triassic
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Anisian (1)
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Moenkopi Formation (5)
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Nicola Group (1)
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Shublik Formation
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