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National Geologic Map Database

Geologic Unit: Sharps

Usage:

Sharps Formation (NE)
Sharps Formation of Arikaree Group (SD)


Subunits:

Rockyford Ash Member (SD).


Geologic age:

Tertiary
Miocene, early


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

Lower part in SW/4 NW/4 sec. 31, T. 41 N., R. 42 W.; upper part from NW/4 sec. 30, T. 39 N., R. 43 W. northeast into NE/4 sec. 20, T. 39 N., R. 43 W. Named from Sharps Corner, Shannon Co., SD (Harksen and others, 1961).


AAPG geologic province:

Chadron arch


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 ([ ]).