CSUN Loc. 471b - 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 201247: 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.
Malacostraca
 Decapoda - Panopeidae
Glyphithyreus weaveri Rathbun 1926 crab
Bivalvia
 Ostreida - Malleidae
"Nayadina (Exputens) llajasensis" = Exputens llajasensis
"Nayadina (Exputens) llajasensis" = Exputens llajasensis Clark 1934 oyster
Gastropoda
 Architaenioglossa - Ampullinidae
Eocernina hannibali Dickerson 1914 snail
 Tonnoidea - Cassidae
"Phalium (Semicassis) tuberculiformis" = Morio (Sconsia) tuberculatus
"Phalium (Semicassis) tuberculiformis" = Morio (Sconsia) tuberculatus Squires 1984 snail