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National Geologic Map Database

Geologic Unit: Omadi

Usage:

Omadi Sandstone of Dakota Group (CO,KS,NE*,WY)
Omadi Formation of Dakota Group (CO,KS,NE,WY)


Subunits:

(alphabetical): Cruise Sandstone Member (CO,KS,NE,WY), Fall River Member (NE), Gurley Sandstone Member (CO,KS,NE,WY), Huntsman Shale Member (CO,KS,NE,WY), Newcastle Member (NE).


Geologic age:

Late Cretaceous*


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

Type section: in Missouri River bluffs extending through Omadi Twp., Dakota Co., eastern NE. Term Omadi relates to an abandoned town, Omaha Creek, and the Omaha Indians (Condra and Reed, 1943).


AAPG geologic province:

Salina 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 ([ ]).