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Usage:
Deer Valley Formation (CA)
Geologic age:
Late Cretaceous (Maastrichtian)
Type section, locality, area and/or origin of name:
Type section: exposures on north wall of Oil Canyon between point at base of formation, 650 ft W. and 2,000 ft S. of NE cor. sec. 15, T. 1 N., R 1 E., and point at top of formation, 650 ft W. and 1,800 ft S. of NE cor. sec. 15, T. 1 N., R. 1 E., Contra Costa Co., northern CA. Formation exposed only on north flank of Mount Diablo on ridge separating Briones Valley from Deer Valley (Colburn, 1964).
AAPG geologic province:
Sacramento 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 ([ ]).