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geologic age
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upper Quaternary (10)
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Pliocene
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lower Pliocene (1)
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Paleogene
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London Clay (4)
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middle Eocene
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Barton Clay (3)
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Paleozoic
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Pocono Formation (2)
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Upper Mississippian
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Upper Carboniferous
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Devonian
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Upper Ordovician
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Permian
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Silurian
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Lower Silurian
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Tuscarora Formation (2)
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upper Paleozoic
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Dwyka Formation (1)
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Precambrian
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igneous rocks
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illite (2)
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Primary terms
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absolute age (31)
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Africa
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Arctic region
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