Usage:
Harding Sandstone (CO*,WY)
Harding Quartzite (CO*)
Harding Formation (CO)
Geologic age:
Late Ordovician*
Type section, locality, area and/or origin of name:
Named from exposures in Harding's quarry, about 1 mi northwest of 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] (Walcott, 1892; See also Sweet, 1954, AAPG Bull., v. 38, no. 2).
AAPG geologic province:
Denver basin*
Piceance basin*
Eagle basin*
Las Vegas-Raton basin*
South Park basin*
San Luis 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 ([ ]).