radioactive isotopes
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samarium
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Sm-147/Nd-144 (3)
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nitrogen
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noble gases
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Ar-38/Ar-36 (1)
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Ar-40/Ar-36 (1)
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helium
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He-3 (1)
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He-4/He-3 (3)
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neon
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Ne-21 (2)
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Ne-22/Ne-20 (1)
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Ne-22/Ne-21 (1)
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radon
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oxygen
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O-18/O-16 (10)
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short-lived isotopes (1)
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sulfur (1)
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fossils
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Chordata
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Vertebrata
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Carnivora
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Fissipeda
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Felidae
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Perissodactyla
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Hippomorpha
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Equidae
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Equus (1)
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Primates
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Hominidae
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Homo
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Proboscidea
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Elephantoidea
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Elephantidae
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Mastodontoidea (1)
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ichnofossils (2)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda (3)
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Mollusca
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Veneroida (1)
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Gastropoda (1)
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Porifera (1)
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Protista
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Foraminifera
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Radiolaria (1)
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microfossils
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pollen (6)
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Plantae
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algae
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diatoms (3)
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Spermatophyta
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tracks (2)
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geochronology methods
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Ar/Ar (10)
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exposure age (10)
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geologic age
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Cenozoic
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Quaternary
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Atlantic (1)
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Neoglacial
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Preboreal (1)
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upper Holocene
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Pleistocene
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upper Quaternary
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Stone Age
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Tertiary
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upper Miocene (1)
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Paleogene
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Eocene
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Tyee Formation (1)
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Oligocene
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upper Oligocene (1)
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Paleocene (2)
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upper Cenozoic (2)
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Lake Bonneville (2)
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Laurentide ice sheet (6)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Upper Cretaceous
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Jurassic
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Coast Range Ophiolite (1)
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Triassic
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MIS 6 (1)
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Paleozoic
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic (4)
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igneous rocks
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igneous rocks
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gabbros (2)
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pyroxenite
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volcanic rocks
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flood basalts (2)
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basanite (3)
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volcanic ash (2)
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pyroxene group
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framework silicates
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silica minerals
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orthosilicates
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zircon group
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zircon (7)
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sheet silicates
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clay minerals
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kaolinite (1)
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illite (1)
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sulfates (1)
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sulfides
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galena (1)
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tungstates
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scheelite (1)
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Primary terms
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absolute age (107)
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Africa
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Asia
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Far East
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China
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Japan
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biogeography (4)
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carbon
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C-13 (1)
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Caribbean region
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Caspian Sea (2)
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Cenozoic
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Quaternary
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Atlantic (1)
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Mesolithic (1)
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Neoglacial
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Little Ice Age (1)
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Preboreal (1)
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upper Holocene
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Little Ice Age (1)
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Pleistocene
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Illinoian (2)
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Matuyama Chron (1)
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upper Pleistocene
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upper Weichselian
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Allerod (3)
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Wisconsinan
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lower Wisconsinan (4)
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Fraser Glaciation (1)
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upper Quaternary
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Brunhes Chron (1)
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Stone Age
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Mesolithic (1)
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Tertiary
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lower Tertiary (1)
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Neogene
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Miocene
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Columbia River Basalt Group (1)
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Tiva Canyon Member (1)
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Topopah Spring Member (1)
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upper Miocene (1)
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Pliocene (1)
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Paleogene
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Eocene
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middle Eocene
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Tyee Formation (1)
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Oligocene
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upper Oligocene (1)
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Paleocene (2)
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upper Cenozoic (2)
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Central America
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Chordata
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Cervus (1)
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Carnivora
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Felidae
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Smilodon (1)
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Perissodactyla
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Hippomorpha
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Equus (1)
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Primates
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Homo
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Proboscidea
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Elephantoidea
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Elephantidae
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Mammuthus (2)
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Mastodontoidea (1)
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clay mineralogy (1)
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Integrated Ocean Drilling Program
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Expedition 324
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intrusions (9)
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Invertebrata
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Mollusca
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Bivalvia
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Heterodonta
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Gastropoda (1)
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Porifera (1)
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Foraminifera
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Globigerinacea
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