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National Geologic Map Database

Geologic Unit: Fremont

Usage:

Fremont Limestone (CO*)
Fremont Dolomite (CO*)
Fremont Formation (CO)


Subunits:

Priest Canyon Member (CO).


Geologic age:

Late Ordovician*


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

Type section: Harding's quarry, about 1 mi northwest of the State Penitentiary at Canyon City [Canon City], Fremont Co., CO. [Quarry now (ca. 1966) one of several pits operated under name of Bernite Gannister Quarries.] Named from exposures in Fremont Co., CO (Walcott, 1892; see also Lovering and Goddard, 1950, USGS Prof. Paper 223).


AAPG geologic province:

Denver basin*
Eagle basin*
Las Vegas-Raton basin*
San Luis basin*
Piceance basin*
South Park 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 ([ ]).