LACMIP loc. 41691, North side of Simi Valley (Paleocene of the United States)

Also known as CSUN loc. 1691

Where: Ventura County, California (34.3° N, 118.7° W: paleocoordinates 39.2° N, 96.6° W)

• coordinate stated in text

When: Santa Susana Formation, Danian (66.0 - 61.6 Ma)

• Lower Santa Susana Formation (upper lower Paleocene [upper Danian]).

Environment/lithology: offshore; lithified siltstone and gray siltstone

• This specimen is from a thin, poorly exposed Turritella-rich storm bed consisting of mollusks, arthropods, and bivalve-bored petrified wood that all underwent relatively short-distance, post-mortem transport, probably by turbidity currents emanating from inner-shelf depths. The immediately underlying and overlying strata consist of gray siltstone.

Size class: macrofossils

Collected by P.J. Lipman, J. Lipman, and R.L. Squires in Fall, 2015; reposited in the LACM

Collection methods: surface (in situ),

• a temporary locality no longer accessible because of development and now covered by landscaping

Primary reference: R. L. Squires. 2018. First report of Oniscidia Mörch, 1852 (Neogastropoda, Harpidae) in the northeast Pacific fossil record and paleobiogeographic review of the genus. Journal of Paleontology 92(5):794-803 [J. Marcot/J. Marcot]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 221983: authorized by Jonathan Marcot, entered by Jonathan Marcot on 03.09.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

• "...along with a moderately diverse molluscan fauna."
Show authors, comments, and common names
Gastropoda
 Neogastropoda - Fasciolariidae
Saxituberosa titan
Saxituberosa titan Waring 1917 snail
 Neogastropoda - Harpidae
Oniscidia plectata
Oniscidia plectata Waring 1917 snail
 Cerithioidea - Turritellidae
Turritella peninsularis, Turritella reversa
Turritella peninsularis Anderson and Hanna 1935 turret shell
as as Turritella peninsularis (ss.) and ssp. Turritella peninsularis qualeyi
Turritella reversa Waring 1917 turret shell
Bivalvia
 Ostreida - Gryphaeidae
Phygraea haleyi
Phygraea haleyi Hertlein 1933 oyster