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helium (1)
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oxygen
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O-18/O-16 (9)
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phosphorus (3)
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silicon
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Si-29 (6)
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sulfur (7)
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fossils
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Archaea (1)
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Acidithiobacillus
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Pseudomonas (1)
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Invertebrata
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Spermatophyta
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thallophytes (3)
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geochronology methods
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geologic age
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Cenozoic
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Quaternary
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Tertiary
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Neogene
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Pliocene (2)
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Paleogene
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Dongying Formation (1)
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upper Eocene
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Huber Formation (1)
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Oligocene
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Boom Clay (1)
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Fish Canyon Tuff (1)
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Wasatch Formation (1)
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Shahejie Formation (2)
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Mesozoic
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Cretaceous
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Maestrichtian (1)
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Senonian (2)
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Jurassic
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Pliensbachian (1)
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Triassic
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Paleozoic
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Carboniferous
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Upper Carboniferous
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Devonian (2)
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Ordovician
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Silurian (1)
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upper Precambrian
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Proterozoic
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Paleoproterozoic (3)
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Witwatersrand Supergroup (1)
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rutile (3)
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nepheline group
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garnierite (1)
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zircon group
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zircon (2)
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sorosilicates
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axinite group (1)
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epidote group
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allanite (1)
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epidote (2)
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zoisite (1)
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ilvaite (1)
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ring silicates
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beryl (1)
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sheet silicates
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cerolite (3)
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chlorite group
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clinochlore (3)
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sudoite (4)
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clay minerals
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allophane (15)
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imogolite (8)
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hydrobiotite (3)
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illite (148)
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mica group
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paragonite (2)
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palygorskite (40)
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pyrophyllite (9)
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serpentine group
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talc (13)
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sulfates
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tellurides
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uranium minerals (2)
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Primary terms
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absolute age (5)
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Africa
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Antarctica
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Asia
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atmosphere (2)
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bacteria
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carbon
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Cenozoic
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Tertiary
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Huber Formation (1)
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Wasatch Formation (1)
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Shahejie Formation (2)
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