Usage:
Brock Shale (CA*)
Geologic age:
Late Triassic*
Type section, locality, area and/or origin of name:
Named from exposures on Brock Mountain, Redding quadrangle, scale 1:125,000 (1901 ed.), Shasta Co., northern CA (Diller, 1906).
[Brock Mountain (now Gray Rocks, https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/260833) is located between Squaw Creek (now Sulanharas Creek) and Pit River, about 2 mi southeast of Winnibulli Mountain, in secs. 5 and 8, T. 34 N., R. 2 W., approx. Lat. 40 deg. 49 min. 45 sec. N., Long. 122 deg. 07 min. 00 sec. W., Devils Rock 7.5-min quadrangle, Shasta National Forest / Whiskeytown-Shasta-Trinity National Recreation Area, Shasta Co., northern CA. (Additional locality information from USGS GNIS database and USGS historical topographic map collection TopoView, accessed on September 4, 2023).]
AAPG geologic province:
Klamath Mountains province*
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 ([ ]).