CAS Loc. 1291, Peterson Ranch: Cenomanian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Trigoniida - Steinmanellidae
Trigonia colusaensis n. sp. Anderson 1958
Bivalvia - Trigoniida - Trigoniidae
Trigonia aequicostata Gabb 1869
Bivalvia - Hippuritida - Radiolitidae
Durania ? californica Anderson 1958
Bivalvia - Myalinida - Inoceramidae
Inoceramus eolobatus n. sp. Anderson 1958
Cephalopoda - Ammonitida - Turrilitidae
Turrilites petersoni n. sp. Anderson 1958
Cephalopoda - Ammonitida - Desmoceratidae
Parapuzosia colusaensis (Anderson 1902)
Gastropoda - Turritellidae
Turritella petersoni n. sp. Merriam 1941
Gastropoda - Pseudomelaniidae
Acteonina colusaensis n. sp. Anderson 1958
see common names

Geography
Country:United States State/province:California County:Colusa
Coordinates: 39.3° North, 122.3° West (view map)
Paleocoordinates:40.5° North, 82.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Cenomanian 10 m.y. bin: Cretaceous 5
Key time interval: Cenomanian
Age range of interval: 100.5 - 93.9 m.y. ago
Stratigraphy
Geological group:Great Valley Formation:Antelope
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Antelope Shale (informal) of the Great Valley Group, just below the Venado Formation. Further details published in Saul (1982) and Squires and Saul 2003, 2004). AGE: Cenomanian based on molluscan biostratigraphy; upper Albian accordng to Matsumoto (1960).

[Squires and Saul 2004] Saul (1978, p. 38-39) noted that CAS locality 1291 is the type locality of several megafossil spe­cies of different geologic ages. It is likely that these specimens are from either the Antelope Shale or the overlying Venado Sand­ stone Member of the informal Cortina Formation. Both the An­ telope Shale and the Venado Sandstone Member are dominantly turbiditic and the basal part of the Venado contains lenses of submarine-slump deposits (Ghosh and Lowe, 1993). The Ante­lope Shale is largely Cenomanian in age but includes strata of late Albian age at its base. The Venado Sandstone Member is of early Turonian age and it contains reworked fossils of late Albian in age (Matsumoto, 1960, p. 34-35; Popenoe et al., 1960, chart 10e).
Lithology and environment
Primary lithology: lithified "shale"
Includes fossils?Y
Lithology description: GENERAL LITHOLOGY: Assumed tio be shale based on lithologic description. LITHIFICATION: Assumed lithified based on lithologic description and figured specimens.
Environment:offshore
Geology comments: ENVIRONMENT: In general regarded as shallow water, though some units includes assemblages displaced into deeper waters through turbidity currents. Here assigned to a siliciclastic offshore environments on the basis of lithology.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:CAS
Collection method comments: COLLECTOR: Unknown collected. REPOSITORY: CAS, California.
Taxonomic list comments:COVERAGE: Only includes Turritella (Gastropoda), therefore very limited. NOMENCLATURE: Authoritative publication with species-level assignments.
Metadata
Also known as:4 miles north of Sites; CSMB loc. 12785
Database number:69609
Authorizer:A. Hendy, J. Marcot Enterer:A. Hendy, J. Marcot
Modifier:J. Marcot Research group:marine invertebrate
Created:2007-02-28 06:50:11 Last modified:2023-09-05 14:55:25
Access level:the public Released:2007-02-28 06:50:11
Creative Commons license:CC BY
Reference information

Primary reference:
11610. F. M. Anderson. 1958. Upper Cretaceous of the Pacific Coast. Geological Society of America Memoir 71:1-378 [A. Miller/A. Hendy/M. Clapham]

Secondary references:

29214 T. Matsumoto. 1960. Upper Cretaceous ammonites of California. Part III. Memoirs of the Faculty of Science, Kyushu University Series D, Geology, Special Volume II 1-204 [A. Hendy/A. Hendy/A. Hendy]
18617 R. L. Squires and L. R. Saul. 2006. Additions and refinements to Aptian to Santonian (Cretaceous) Turritella (Mollusca: Gastropoda) from the Pacific Slope of North America. The Veliger 48(1):46-60 [A. Miller/A. Hendy]