- Usage in publication:
-
- Dry Creek formation
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Shale
- Sand
- AAPG geologic province:
-
- Sacramento basin
Summary:
Named for tributary of Dry Creek, Chico quad, north-central CA. Best section exposed in steep-walled valley of the tributary. Consists of lower beds of gray shales with flakes of biotite and casts of Eocene fossils overlain by light-colored biotite sands containing fragments of woods and leaves. Thickness is over 180 feet. Conformably underlies Ione formation. Overlies Chico sandstone. Age is Eocene based on casts of CORBICULA collected by H.W. Turner.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Dry Creek sandstone member*
- Modifications:
-
- Revised
- Age modified
- Biostratigraphic dating
- AAPG geologic province:
-
- Sacramento basin
Summary:
Dry Creek formation of Allen (1929) here considered "Dry Creek" sandstone member of Ione formation. Shown in columnar section at Fig Tree Gulch. Age is middle Eocene, based on TURRITELLA MERRIAMI from micaceous silty sandstone in unit.
["Dry Creek" is in quotation marks because name is already occupied for unit in MT.]
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).