CSUN Loc. 1344, Simi Hills (Eocene of the United States)

Where: Ventura County, California (34.2° N, 118.7° W: paleocoordinates 36.8° N, 101.8° W)

When: Santa Susana Formation, Ypresian (56.0 - 47.8 Ma)

• within upper 100m of Santa Susana Formation

Environment/lithology: offshore; lag, gray, silty sandstone

• The upper 100 m of the approximately 1000-m-thick Santa Susana Formation in the Simi Valley area consists mostly of gray, very fine-grained sandstone, with some gray muddy to sandy siltstone. Locally, there are concentrations of fossil-shell hash, and rocks surrounding these localized concentrations are barren of megafossils. The lower part of the upper 100 m of the Santa Susana Formation has a gradational lithology from the underlying gray mudstone and siltstone.

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected by R.L. Squires, in 14, 1989; reposited in the LACM

Collection methods: bulk,

Primary reference: R. L. Squires. 1999. Upper Paleocene to Lower Eocene ("Meganos Stage") Marine Megafossils in the Uppermost Santa Susana Formation, Simi Valley, Southern California. Contributions in Science, Los Angeles County Museum 479:1-38 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 207323: authorized by Jonathan Marcot, entered by Jonathan Marcot on 06.01.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Pholadida - Corbulidae
Corbula (Caryocorbula) dickersoni
Corbula (Caryocorbula) dickersoni Weaver and Van Winkle Palmer 1922 clam
 Cardiida - Veneridae
Pitar uvasana
Pitar uvasana Conrad 1855 venus clam
as Pitar uvasana coquillensis
Gastropoda
 Opisthobranchia - Retusidae
Cylichnina tantilla
Cylichnina tantilla Anderson and Hanna 1925 snail
 Heterostropha - Ringiculidae
Ringicula (Ringicula) pinguis