- Usage in publication:
-
- French Valley formation
- Modifications:
-
- First used
- AAPG geologic province:
-
- Peninsular Ranges province
Summary:
Mapped in Winchester area, Riverside Co., CA. [Cites "naming paper", "Schwarcz, in press"]
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- French Valley formation
- Modifications:
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- Named
- Dominant lithology:
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- Schist
- Quartzite
- AAPG geologic province:
-
- Peninsular Ranges province
Summary:
Named for type locality on E side of French Valley, Winchester area (lat 33 deg 37'36"N and long 117 deg 00'00"W), Riverside Co., CA. Name first used (Schwarcz, 1966). Has been informally subdivided into members (ascending), A (4810 ft. thick), B (5450 ft. thick), and C (3000 ft. thick) according to lithology. Consists of quartzite, conglomerates, schists, and amphibolite. Interfingers with and conformably overlies the Bedford Canyon Formation. Intruded by igneous rocks of Cretaceous age. Considered Late Jurassic(?) age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- French Valley formation
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Peninsular Ranges province
Summary:
Rocks 1 mi E of Sun City, interbedded in Bedford Canyon Formation of Larsen (1948), most closely resemble French Valley Formation of Schwarcz (1969). Is designated Triassic(?) age or older based on pelecypods identified by G.E.G. Westerman of McMaster Univ., Canada.
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 ([ ]).