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