Usage:
Blackwood Creek Formation (CA*)
Geologic age:
Early Jurassic*
Type section, locality, area and/or origin of name:
Type locality: exposures in and adjacent to the upper reaches of Blackwood Creek, in sec. 9, T. 14 N., R. 16 E., Homewood 7.5-min quadrangle [Placer Co., CA] (Harwood, 1992).
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 ([ ]).