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

Geologic Unit: Dry Creek

Usage:

/Dry Creek sandstone member [informal] of Ione Formation (CA*)

[Preoccupied. Name previously applied to Dry Creek Shale by Peale (1893) in MT.] Considered informal by the USGS. For informal usage, the rank or lithologic term should not be capitalized.


Geologic age:

Tertiary
Eocene, middle


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

Named from beds on tributary of Dry Creek, Chico quadrangle, north-central CA (Allen, 1929).


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