CSUN Loc. 371 - Santa Susana Mountains [Llajas Fm] (Eocene to of the United States)

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 8011: authorized by Linda Ivany, entered by Elizabeth Kowalski on 12.06.2000, edited by Austin Hendy and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• New species only.
 Arcida - Glycymerididae
"Glycymeris (Glycymerita) sagittata" = Axinaea sagittata1
"Glycymeris (Glycymerita) sagittata" = Axinaea sagittata1 Gabb 1864 clam
 Mytilida - Mytilidae
Brachidontes (Brachidontes) cowlitzensis1 Weaver and Palmer 1922 mussel
 Carditida - Carditidae
"Glyptoactis (Glyptoactis) domenginica" = Glyptoactis (Claibornicardia) domenginica1
"Glyptoactis (Glyptoactis) domenginica" = Glyptoactis (Claibornicardia) domenginica1 Vokes 1939 clam
 Pholadida - Corbulidae
"Corbula (Caryocorbula) dickersoni" = Corbula dickersoni1
"Corbula (Caryocorbula) dickersoni" = Corbula dickersoni1 Weaver and Palmer 1922 clam
 Cardiida - Glossidae
"Callocardia (Nitidavenus) tejonensis" = Isocardia tejonensis1
"Callocardia (Nitidavenus) tejonensis" = Isocardia tejonensis1 Waring 1914 clam
 Cardiida - Veneridae
 Cardiida - Cardiidae
 Opisthobranchia - Retusidae
Cylichnina tantilla1 Anderson and Hanna 1925 snail
 Triphoroidea - Cerithiopsidae
Cerithiopsis llajasensis n. sp.1 Squires 1984 snail
 Architaenioglossa - Ampullinidae
Eocernina hannibali1 Dickerson 1914 snail
Pachycrommium clarki1 Stewart 1927 snail
 Neogastropoda -
Ancilla (Spirancilla) gabbi1 Cossman 1899 snail
 Neogastropoda - Buccinidae
Pseudoliva lineata1 Gabb 1864 true whelk
 Neogastropoda - Fasciolariidae
Clavilithes sp. n. sp., Fusinus aff. ucalius1, "Clavilithes tabulatus" = Clavella tabulata1
Clavilithes sp. n. sp. Swainson 1840 snail
Fusinus aff. ucalius1 Vokes 1939 snail
"Clavilithes tabulatus" = Clavella tabulata1 Dickerson 1913 snail
 Neogastropoda - Mitridae
"? Proximitra cretacea" = Mitra cretacea1
"? Proximitra cretacea" = Mitra cretacea1 Gabb 1864 mitre shell
 Neogastropoda - Volutidae
Lyria andersoni1 Waring 1917 volute
 Neogastropoda - Muricidae
Pterynotus (Pterynotus) washingtonicus2, "Laevityphis (Laevityphis) antiquus" = Typhis antiquus1
Pterynotus (Pterynotus) washingtonicus2 Squires and Goedert 1995 mustached bat
"Laevityphis (Laevityphis) antiquus" = Typhis antiquus1 Gabb 1864 murex snail
 Neogastropoda - Turridae
? Cochlespiropsis jenkinsi n. sp.2, "Fusiturricula (Crenaturricula) crenatospira" = Crenaturricula crenatospira1, "Pleurofusia fresnoensis" = Pleurotoma fresnoensis1
? Cochlespiropsis jenkinsi n. sp.2 Squires 2001 turrid
"Fusiturricula (Crenaturricula) crenatospira" = Crenaturricula crenatospira1 Cooper 1894 turrid
as Fusiturricula (Crenaturricula) crenatospira domenginica
"Pleurofusia fresnoensis" = Pleurotoma fresnoensis1 Arnold 1910 turrid
 Neogastropoda -
Domenginella claytonensis1 Gabb 1864 snail
 Neogastropoda - Conidae
Conus caleocius1 Vokes 1939 cone shell
Conus hornii1 Gabb 1864 cone shell
as Conus hornii umpquaensis
 Stromboidea - Strombidae
"Surculites mathewsonii" = Fusus mathewsonii1, "Ectinochilus (Macilentos) macilentus" = Rimella macilenta1
"Surculites mathewsonii" = Fusus mathewsonii1 Gabb 1864 true conch
"Ectinochilus (Macilentos) macilentus" = Rimella macilenta1 White 1889 true conch
 Stromboidea - Seraphsidae
Paraseraphs erraticus1 Cooper 1894 snail
 Ficoidea - Ficidae
Ficopsis remondii1 Gabb 1864 fig shell
as Ficopsis remondii crescentensis
 Naticoidea - Naticidae
Natica (Naticarius) aff. uvasana1 Gabb 1864 moon snail
Sinum obliquum1 Gabb 1864 moon snail
Amaurellina caleocia2 Vokes 1939 moon snail
Tejonia moragai1 Stewart 1927 moon snail
 Calyptraeoidea - Calyptraeidae
Calyptraea diegoana1 Conrad 1855 slipper shell
 Tonnoidea - Ranellidae
Cymatium janetae n. sp. Squires 1983 triton shell
 Tonnoidea - Bursidae
Ranellina pilsbryi1 Stewart 1927 frog shell
 Tonnoidea - Cassidae
"Galeodea (Gomphopages) susanae" = Galeodea sutterensis1, "Phalium (Semicassis) tuberculiformis" = Morio (Sconsia) tuberculatus1
"Galeodea (Gomphopages) susanae" = Galeodea sutterensis1 Dickerson 1916 snail
"Phalium (Semicassis) tuberculiformis" = Morio (Sconsia) tuberculatus1 Gabb 1864 snail
 Sorbeoconcha - Turritellidae
Turritella uvasana1 Conrad 1855 turret shell
as Turritella uvasana applinae
Turritella buwaldana1 Dickerson 1916 turret shell
 Architectonicoidea - Architectonicidae
"Architectonica (Architectonica) llajasensis" = Architectonica llajasensis1, "Architectonica (Stellaxis) cognata" = Architectonica cognata1
"Architectonica (Architectonica) llajasensis" = Architectonica llajasensis1 Sutherland 1966 sundial
"Architectonica (Stellaxis) cognata" = Architectonica cognata1 Gabb 1864 sundial
 Dentaliida - Dentaliidae
Dentalium stentor1 Anderson and Hanna 1925 tusk shell
Dentalium (Laevidentalium) calafium1 Vokes 1939 tusk shell
 Lamniformes - Lamnidae
Isurus cf. praecursor1 Thurmond and Jones 1981 mako shark