CSUN 447, Las Llajas Canyon (Eocene of the United States)

Where: Ventura County, California (34.3° N, 118.7° W: paleocoordinates 35.1° N, 104.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• The stewart bed is a 1 m thick sandstone unit in the middle of the LLajas formation. Lutetian, chron 21r according to Squires (2001).

• bed-level stratigraphic resolution

Environment/lithology: offshore; bioturbated sandstone

• The Stewart bed is located in a section of transition from shallow-marine to outer slope and shelf facies.
• sandstone.

Size class: macrofossils

Reposited in the LACM

Collection methods: bulk,

• Repository: Formerly California State University Northridge (CSUN)

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: general faunal/floral analysis

PaleoDB collection 200838: authorized by Jonathan Marcot, entered by Jonathan Marcot on 22.04.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Ostreida - Malleidae
"Nayadina (Exputens) llajasensis" = Exputens llajasensis
"Nayadina (Exputens) llajasensis" = Exputens llajasensis Clark 1934 oyster
 Carditida - Crassatellidae
Crassatella uvasana Conrad 1855 clam
Gastropoda
 Architaenioglossa - Ampullinidae
Eocernina hannibali Dickerson 1914 snail
Pachycrommium clarki Stewart 1927 snail
 Neogastropoda - Turridae
Surculites mathewsonii Gabb 1864 turrid
 Stromboidea - Strombidae
"Ectinochilus (Macilentos) macilentus" = Ectinochilus (Macilentos) macilenta
"Ectinochilus (Macilentos) macilentus" = Ectinochilus (Macilentos) macilenta White 1889 true conch
 Tonnoidea - Cassidae
"Galeodea (Caliagaleodea) californica" = Galeodea californica
"Galeodea (Caliagaleodea) californica" = Galeodea californica Clark 1942 snail
 Sorbeoconcha - Turritellidae
Turritella andersoni Dickerson 1916 turret shell
as Turritella andersoni lawsoni
 Architectonicoidea - Architectonicidae
"Architectonica (Stellaxis) cognata" = Stellaxis cognata
"Architectonica (Stellaxis) cognata" = Stellaxis cognata Gabb 1864 sundial
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium stentor Anderson and Hanna 1925 tusk shell
Anthozoa
 Scleractinia - Montlivaltiidae
"? Trochocyathus striatus" = Trochosmilia striata
"? Trochocyathus striatus" = Trochosmilia striata Gabb 1864 stony coral