- Usage in publication:
-
- Boxer Formation
- Modifications:
-
- First used
- Dominant lithology:
-
- Mudstone
- Siltstone
- AAPG geologic province:
-
- Sacramento basin
Summary:
Named listed in correlation chart. Referred to as Boxer petrofacies which is described as mainly mudstone and siltstone with prominent packets of conglomerate and sandstone in the lower part. Overlies Lodoga Formation; underlies Cortina Formation. All are part of Great Valley sequence. Age of Boxer is given as Cenomanian (Late Cretaceous).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Boxer Formation
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Siltstone
- Conglomerate
- Sandstone
- AAPG geologic province:
-
- Sacramento basin
Summary:
[Type section] in low hills adjacent to Boxer Valley and west-facing slope of Cortina Ridge, Wilbur Springs 7.5' quad, Colusa Co, CA. Composed of dark-gray thin-bedded to laminated siltstone, fine-grained sandstone, and basal olive-green, thinly bedded to massive conglomerate, Salt Creek Conglomerate Member [formerly Salt Creek Conglomerate of Taliaferro (1954)]. Is from 1,600 to 2,900 m thick. Contains fossils of Cenomanian age in lowermost and uppermost part. Conformably overlies Lodoga Formation; conformably underlies or intertongues with Cortina Formation. Is Late Cretaceous age.
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 ([ ]).