Usage:
Screwauger Breccia (CA*)
Geologic age:
Ordovician(?)* to Devonian(?)*
Type section, locality, area and/or origin of name:
Exposures on southwest slope of Duncan Peak and in the adjacent upper reaches of Screwauger Canyon (in sec. 9, 10, 15, and 16, T. 15 N., R. 13 E., Duncan Peak 7.5-min quadrangle), Placer Co., CA (Harwood and others, 1995).
AAPG geologic province:
Sierra Nevada 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 ([ ]).