Chico area south of the Santa Monica Mountains (Locality 3 of Waring 1917) (Cretaceous of the United States)

Where: Los Angeles County, California (34.1° N, 118.5° W: paleocoordinates 38.6° N, 85.4° W)

• coordinate estimated from map

When: Tuna Canyon Formation, Late/Upper Cretaceous (100.5 - 66.0 Ma)

• Originally described as "Chico," but now mapped as Tuna Canyon (Yerkes and Showalter 1993)

Environment/lithology: marine; sandstone and shale

• "The Chico strata of the Calabasas sheet are lithologically like those of the northern Coast Ranges, and contain a similar fauna. They consist of a lower sandstone and an upper shale member, both of upper Chico age."

Size classes: macrofossils, mesofossils

Reposited in the CAS

• Leland Stanford Junior University Paleontology Collections, eventually transferred to the California Academy of Sciences

Primary reference: C. A. Waring. 1917. Stratigraphic and faunal relations of the Martinez to the Chico and Tejon of Southern California. Proceedings of the California Academy of Sciences 7(4):41-124 [L. Villier/L. Villier]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 193034: authorized by Jonathan Marcot, entered by Jonathan Marcot on 04.05.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

 Myalinida - Inoceramidae
Inoceramus whitneyi Gabb 1869 clam
Inoceramus pembertoni n. sp. Waring 1917 clam
 Ostreida - Pinnidae
Pinna calamitoides Shumard 1858 oyster
 Carditida - Crassatellidae
"Crassatellites conradianus" = Crassatella, Crassatellites triangulatus n. sp.
"Crassatellites conradianus" = Crassatella clam
Crassatellites triangulatus n. sp. Waring 1917 clam
 Cardiida - Mactridae
"Mactra gabbiana" = Cymbophora gabbiana
"Mactra gabbiana" = Cymbophora gabbiana Anderson 1902 clam
 Cardiida - Veneridae
Chione varians venus clam
"Venus pertenuis" = Clementia (Egesta) pertenuis Gabb 1864 venus clam
 Hiatellida - Hiatellidae
Glycimeris veatchii Gabb 1864 clam
 Pholadomyida - Pholadomyidae
Pholadomya subelongata Meek 1857 clam
 Stromboidea - Aporrhaidae
"Pugnellus rotundus n. sp." = Lispodesthes rotundatus
"Pugnellus rotundus n. sp." = Lispodesthes rotundatus Waring 1917 snail
 Ammonitida - Placenticeratidae
Placenticeras sanctaemonicae n. sp. Waring 1917 ammonite
Placenticeras pacificum Smith 1900 ammonite
Placenticeras californicum Anderson 1902 ammonite