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stable isotopes
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Be-10/Be-9 (2)
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C-13/C-12 (2)
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He-3 (4)
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Nd-144/Nd-143 (2)
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metals
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Sr-87/Sr-86 (6)
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aluminum
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Al-26 (27)
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iron (1)
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lead
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rare earths
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noble gases
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helium
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oxygen
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O-18/O-16 (5)
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short-lived isotopes (1)
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S-34/S-32 (1)
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fossils
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Chordata
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Mammalia
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Equidae
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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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Reptilia
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Invertebrata
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Plantae
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Gymnospermae
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tracks (1)
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Stone Age
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Tertiary
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Pliocene
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Tesuque Formation (1)
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Paleogene
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Oligocene
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Laurentide ice sheet (1)
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Mesozoic
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Cretaceous
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Jurassic (3)
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Paleozoic
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Watahomigi Formation (1)
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Devonian (1)
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Silurian
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Supai Formation (1)
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Precambrian
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orthosilicates
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zircon group
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sheet silicates
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sulfates (1)
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Primary terms
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absolute age (69)
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Africa
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carbon
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Cenozoic
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Stone Age
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Pliocene
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Tesuque Formation (1)
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Paleogene
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Oligocene
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Reptilia
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C-14 (9)
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Cl-36 (7)
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C-13/C-12 (2)
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He-3 (4)
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