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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).