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Smoky Hill Chalk Member
BT
Chronostratigraphic Units
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Phanerozoic
..
Mesozoic
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Cretaceous
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Upper Cretaceous
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Smoky Hill Chalk Member
RT
New Mexico
Colorado
Kansas
South Dakota
Niobrara Formation
SN
Of Niobrara Formation. E Colorado, W Kansas, NE New Mexico, and SE South Dakota.
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