CSUN Loc. 498 - Santa Susana Mountains [Llajas Fm] (Eocene to of the United States)

Also known as LACMIP Loc. 16189

Where: Los Angeles County, California (34.0° N, 118.0° W: paleocoordinates 35.8° N, 102.2° W)

• small collection-level geographic resolution

When: LLajas Formation, Ypresian to Ypresian (56.0 - 41.3 Ma)

• The stewart bed is a 1 m thick sandstone unit in the middle of the LLajas formation.

• 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,

Primary reference: R. L. Squires. 1983. New Mollusks from the Lower Middle Eocene Llajas Formation, Southern California. Journal of Paleontology 57(2):354-362 [L. Ivany/E. Kowalski/J. Marcot]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 8018: authorized by Linda Ivany, entered by Elizabeth Kowalski on 12.06.2000, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• New species only.
 Pholadida - Corbulidae
"Corbula (Caryocorbula) dickersoni" = Corbula dickersoni
"Corbula (Caryocorbula) dickersoni" = Corbula dickersoni Weaver and Palmer 1922 clam
 Opisthobranchia - Retusidae
Cylichnina tantilla Anderson and Hanna 1925 snail
 Triphoroidea - Cerithiopsidae
Cerithiopsis llajasensis Squires 1984 snail
 Architaenioglossa - Ampullinidae
Eocernina hannibali Dickerson 1914 snail
Pachycrommium clarki Stewart 1927 snail
 Neogastropoda - Olividae
Olivella mathewsonii Gabb 1864 olive snail
 Neogastropoda - Volutidae
Lyria andersoni Waring 1917 volute
 Neogastropoda - Turridae
"Fusiturricula (Crenaturricula) crenatospira" = Crenaturricula crenatospira
"Fusiturricula (Crenaturricula) crenatospira" = Crenaturricula crenatospira Cooper 1894 turrid
as Fusiturricula (Crenaturricula) crenatospira domenginica
 Neogastropoda -
 Neogastropoda - Conidae
Conus caleocius Vokes 1939 cone shell
Conus hornii Gabb 1864 cone shell
as Conus hornii umpquaensis
 Stromboidea - Strombidae
"Surculites mathewsonii" = Fusus mathewsonii, "Ectinochilus (Macilentos) macilentus" = Rimella macilenta
"Surculites mathewsonii" = Fusus mathewsonii Gabb 1864 true conch
"Ectinochilus (Macilentos) macilentus" = Rimella macilenta White 1889 true conch
 Tonnoidea - Ranellidae
Cymatium janetae n. sp. Squires 1983 triton shell
 Tonnoidea - Bursidae
Ranellina pilsbryi Stewart 1927 frog shell