Usage:
Black Squirrel Formation of Denver Basin Group (CO-recognized locally in El Paso Co.)
Geologic age:
early Tertiary (Paleocene)
Type section, locality, area and/or origin of name:
Type locality: exposures along CO Highway 83, above and below bridge over Black Squirrel Creek, in sec. 16, T. 12 S., R. 66 W., Monument 7.5-min quadrangle, El Paso Co., CO (J.P. Thorson, 2011, Colorado Geol. Survey, 53 p., incl. geologic maps).
AAPG geologic province:
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 ([ ]).