Usage:
No current usage.
(†Coal Creek Quartzite (CO-recognized locally in Boulder area) considered invalid.)
Geologic age:
Paleoproterozoic
Type section, locality, area and/or origin of name:
Notable exposures in triangular area 7 mi long and up to 3 mi wide near mouth of Coal Creek Canyon, Jefferson and Boulder Cos., central northern CO (G.D. Fraser [abs.], 1949, GSA Bull., v. 60, no. 12, pt. 2, p. 1960).
AAPG geologic province:
Southern Rocky Mountain region
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 ([ ]).