CSUN Loc. 471a - 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; bioturbated sandstone and argillaceous siltstone

• Listed as "shallow marine transgressive" - as from top of unit, which appears to be transgressive, and immediatelty below the apparent "maximum flooding/starvation zone", the offshore environment is chosen for this collection, rather than shallow water indet.
• 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. 2001. Additions to the Eocene megafossil fauna of the Llajas Formation, Simi Valley, southern California. Contributions in Science (Natural History Museum of Los Angeles County) 489:1-40 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51930: authorized by Austin Hendy, entered by Austin Hendy on 04.07.2005, edited by Jonathan Marcot

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.
Show authors, comments, and common names
Chondrichthyes
 Myliobatiformes - Myliobatidae
? Myliobatis sp.
? Myliobatis sp. Cuvier 1816 eagle ray
Gastropoda
 Cerithioidea - Turritellidae
Turritella andersoni
Turritella andersoni Dickerson 1916 turret shell
as Turritella andersoni lawsoni