U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Calaveras

Usage:

Calaveras Formation (CA*)
Calaveras Complex (CA)


Subunits:

FORMATION STATUS (alphabetical) --all in CA: Hodapp Member, Pentz Sandstone Member.


Geologic age:

Carboniferous and Permian*


Type section, locality, area and/or origin of name:

Named from prominent development in Calaveras Co., northern CA (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Sierra Nevada province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).