UCMP loc. 3754, Simi Hills (Paleocene of the United States)

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

• Paleocoordinates: 42.0° N, 89.7° W (Wright 2013)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Santa Susana Formation, Thanetian (59.2 - 56.0 Ma)

• Middle part of Santa Susana Formation. Age: Late Paleocene ("Martinez Stage").

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified, calcareous siltstone

• Deposited in a protected bay (no deeper than 40 to 70 m) with warm-algal-limestone buildups associated with shoals on the bay floor
• Thin coralline-algal-rich micaceous muddy siltstone bed

Size class: macrofossils

Collected by R. N. Nelson? in the 1920s; reposited in the LACM

Primary reference: R. L. Squires and L. R. Saul. 1998. Upper Paleocene Species of the Bivalve Plicatula from Southern California. Journal of Paleontology 72(6):1024-1029 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 220311: authorized by Jonathan Marcot, entered by Jonathan Marcot on 19.05.2021

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Rissoidae
"Turbella sp." = Turboella
"Turbella sp." = Turboella Leach in Gray 1847 snail
 Sorbeoconcha - Tornidae
"Tinostoma sp." = Teinostoma
"Tinostoma sp." = Teinostoma Adams and Adams 1853 snail
 Heterostropha - Ringiculidae
"Tornatellaea pinguis" = Ringicula (Ringicula) pinguis
"Tornatellaea pinguis" = Ringicula (Ringicula) pinguis Gabb 1864 snail
 Trochoidea - Trochidae
Trochus sp.
Trochus sp. Linnaeus 1758 top snail
Bivalvia
 Pectinida - Plicatulidae
Plicatula simiensis n. sp.
Plicatula simiensis n. sp. Squires and Saul 1998 scallop