Chico area north of the Simi fault (Locality 1 of Waring 1917) (Cretaceous of the United States)

Where: Los Angeles County, California (34.2° N, 118.7° W: paleocoordinates 38.7° N, 85.5° W)

• coordinate estimated from map

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

• Originally described as "Chico," but now mapped as Chatsworth (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 193032: authorized by Jonathan Marcot, entered by Jonathan Marcot on 04.05.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

 Arcida - Glycymerididae
"Glycimeris veatchii" = Axinaea veatchii
"Glycimeris veatchii" = Axinaea veatchii Gabb 1864 clam
 Stromboidea - Aporrhaidae
Anchura sp. Conrad 1860 snail
 Ficoidea - Ficidae
Perissolax brevirostris Gabb 1864 fig shell
 Naticoidea - Naticidae
"Gyrodes compressus n. sp." = Euspira compressa, "Gyrodes canadensis" = Gyrodes (Sohlella) canadensis
"Gyrodes compressus n. sp." = Euspira compressa Waring 1917 moon snail
"Gyrodes canadensis" = Gyrodes (Sohlella) canadensis Whiteaves 1903 moon snail
 Ammonitida - Baculitidae
Baculites chicoensis Trask 1856 ammonite
Rostellites gabbi White 1903