CSUN Loc. 473 - Chivo Canyon [Llajas Fm] (Eocene of the United States)

Where: Ventura County, California (34.3° N, 118.7° W: paleocoordinates 35.0° N, 104.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Llajas Formation, Lutetian (47.8 - 41.3 Ma)

• Immediately above the "Stewart Bed", middle of the Llajas Formation, "Domengine" stage, base of CP12b calcareous nannoplankton zone, lower Lutetian stage, Middle Eocene, C21r chron.

• bed-level stratigraphic resolution

Environment/lithology: deep-water; argillaceous siltstone

• Listed as "outer shelf and slope" - as from base of unit, which appears to be highstand to regressive, the deeper-water environment is chosen for this collection.
• Sparsely fossiliferous 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 51921: 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.
Bivalvia
 Ostreida - Malleidae
"Nayadina (Exputens) llajasensis" = Exputens llajasensis
"Nayadina (Exputens) llajasensis" = Exputens llajasensis Clark 1934 oyster
Anthozoa
 Scleractinia - Caryophylliidae
Trochocyathus stantoni Vaughan 1900 stony coral
Orthophragmina
  -
"Pseudophragmina (Proporocyclina) clarki" = Orthophragmina clarki
"Pseudophragmina (Proporocyclina) clarki" = Orthophragmina clarki Cushman 1920