Usage:
Virgin Creek Member of Pierre Shale (NE*,ND*,SD*)
Subunits:
Government Draw Bentonite Beds (SD*).
Geologic age:
Late Cretaceous (Campanian)*
Type section, locality, area and/or origin of name:
Type section: measured along Virgin Creek from 1.5 to 1.8 mi south of Promise, Dewey Co., SD. Named from exposures in valley wall of Virgin Creek, and in the flats and hills above it, 1.5 mi south of Promise, northeastern Dewey Co., SD (Searight, 1937).
AAPG geologic province:
Williston basin*
Sioux uplift*
Salina 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 ([ ]).