CSUN Loc. 471d - Chivo Canyon [Llajas Fm] (Eocene of the United States)

Where: Ventura County, California (34.3° N, 118.7° W: paleocoordinates 36.8° N, 101.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Llajas Formation, Ypresian (56.0 - 47.8 Ma)

• From lower Llajas Formation, lower "Domengine" stage, base of CP12a calcareous nannoplankton zone, upper Ypresian stage, Lower Eocene, C22n chron.

• bed-level stratigraphic resolution

Environment/lithology: offshore; sandstone and argillaceous siltstone

• Alternating laminated and bioturbated sandstones grading into muddy siltstone.

Size class: macrofossils

Preservation: mold/impression

Reposited in the LACM

• Collected by R.L. Squires (1978)

Primary reference: R. L. Squires. 1984. Megapaleontology of the Eocene Llajas Formation, Simi Valley, California. Contributions in Science, Natural History Museum of Los Angeles County 350:1-76 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 201250: authorized by Jonathan Marcot, entered by Jonathan Marcot on 02.05.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca, corals, arthropoda, and includes other groups where obvserved; list compiled from meticulous search of the invert collections at the LACM, private collections and fieldwork.
Bivalvia
 Arcida - Glycymerididae
"Glycymeris (Glycymeris) rosecanyonensis" = Glycymeris rosecanyonensis
"Glycymeris (Glycymeris) rosecanyonensis" = Glycymeris rosecanyonensis Hanna 1927 clam
 Mytilida - Mytilidae
Brachidontes (Brachidontes) cowlitzensis Weaver and Palmer 1922 mussel
 Cardiida - Psammobiidae
Gari cf. eoundulata Vokes 1939 clam
Gastropoda
 Xenophoroidea - Xenophoridae
Xenophora stocki Dickerson 1916 carrier shell
 Tonnoidea - Ranellidae
"Olequahia domenginica" = Ranella domenginica
"Olequahia domenginica" = Ranella domenginica Vokes 1939 triton shell
 Sorbeoconcha - Turritellidae
Turritella uvasana Conrad 1865 turret shell
as Turritella uvasana applinae