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National Geologic Map Database

Geologic Unit: Smoky Hill

Usage:

Smoky Hill Member of Niobrara Formation (WY)
Smoky Hill Shale Member of Niobrara Formation (CO*,NE*,NM*)
Smoky Hill Chalk Member of Niobrara Formation (CO*,KS*,NE*,SD*)
Smoky Hill Marl Member of Niobrara Formation (CO*,NM*)


Geologic age:

Late Cretaceous (Coniacian to Campanian)*


Type section, locality, area and/or origin of name:

Not designated. Named from Smoky Hill River in KS (Cragin, 1896).


AAPG geologic province:

Central Kansas uplift*
Anadarko basin*
Denver basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).