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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).