CSUN Loc. 958, Santa Susana Mountains (Eocene of the United States)

Where: Ventura County, California (34.3° N, 118.7° W: paleocoordinates 36.8° N, 101.7° 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 Aug. 19, 1984; 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 207305: 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
Gastropoda
 Heterostropha - Architectonicidae
Architectonica (Architectonica) llajasensis
 Neotaenioglossa - Calyptraeidae
Calyptraea diegoana
Calyptraea diegoana Conrad 1855 slipper shell
 Cerithioidea - Turritellidae
Turritella buwaldana
Turritella buwaldana Dickerson 1916 turret shell
 Architaenioglossa - Ampullinidae
Pachycrommium clarki
Pachycrommium clarki Stewart 1927 snail
 Neogastropoda - Buccinidae
Brachysphingus mammilatus
Brachysphingus mammilatus Clark and Woodford 1927 true whelk
Bivalvia
 Nuculida - Nuculidae
Acila (Truncacila) decisa
Acila (Truncacila) decisa Conrad 1855 divaricate nutclam
 Nuculanida - Nuculanidae
Nuculana (Saccella) gabbii
Nuculana (Saccella) gabbii Conrad 1866 pointed nut clam
 Pholadida - Corbulidae
"Corbula (Caryocorbula) parilis" = Caryocorbula parilis
"Corbula (Caryocorbula) parilis" = Caryocorbula parilis Gabb 1864 clam
Malacostraca
 Decapoda - Zanthopsidae
"Zanthopsis aff. hendersoni" = Zanthopsis hendersonianus
"Zanthopsis aff. hendersoni" = Zanthopsis hendersonianus Rathbun 1926 crab