CSUN Loc. 374, 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; lithified, 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 CSUN (California State University Northridge)

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 8012: authorized by Linda Ivany, entered by Elizabeth Kowalski on 12.06.2000, edited by Austin Hendy, Matthew Clapham and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Terebratulida - Terebrataliidae
Terebratalia aff. batequia2 Sandy et al. 1995
Polychaeta
 Sabellida - Serpulidae
Bivalvia
 Arcida - Glycymerididae
"Glycymeris (Glycymerita) sagittata" = Glycymeris sagittata1
"Glycymeris (Glycymerita) sagittata" = Glycymeris sagittata1 Gabb 1864 clam
 Pectinida - Pectinoidae
Spondylus carlosensis1 Anderson 1905 scallop
 Ostreida - Gryphaeidae
Pycnodonte (Phygraea) cf. pacifica2 Squires and Demetrion 1990 oyster
 Ostreida - Flemingostreidae
"Ostrea idriaensis" = Acutostrea idriaensis1
"Ostrea idriaensis" = Acutostrea idriaensis1 Gabb 1869 oyster
 Ostreida - Malleidae
"Nayadina (Exputens) llajasensis" = Exputens llajasensis1
"Nayadina (Exputens) llajasensis" = Exputens llajasensis1 Clark 1934 oyster
 Ostreida - Pinnidae
Pinna llajasensis n. sp. Squires 1983 oyster
 Mytilida - Mytilidae
Brachidontes (Brachidontes) cowlitzensis1 Weaver and Palmer 1922 mussel
 Carditida - Crassatellidae
Crassatella uvasana1 Conrad 1855 clam
 Carditida - Carditidae
Venericardia (Pacificor) hornii1 Gabb 1864 clam
as Venericardia (Pacificor) hornii calafia
 Pholadida - Teredinidae
? Teredo sp.1 Linnaeus 1758 clam
 Cardiida - Veneridae
"Marcia (Mercimonia) bunkeri" = Dosinia bunkeri1, Pitar (Calpitaria) uvasanus1, "Pitar uvasana" = Meretrix uvasana2
"Marcia (Mercimonia) bunkeri" = Dosinia bunkeri1 Hanna 1927 venus clam
"Pitar uvasana" = Meretrix uvasana2 Conrad 1855 venus clam
Subspecies: Pitar uvasana coquillensis
 Cardiida - Psammobiidae
"Gari texta" = Gari (Gobraeus) texta2 Gabb 1864 clam
Gari cf. eoundulata1 Vokes 1939 clam
 Cardiida - Cardiidae
"Nemocardium linteum" = Nemocardium (Nemocardium) linteum1, "Acanthocardia (Agnocardia) sorrentoensis" = Acanthocardia (Agnocardia) sorrentoense2, Acanthocardia (Schedocardia) brewerii1
"Nemocardium linteum" = Nemocardium (Nemocardium) linteum1 Conrad 1855 cockle
"Acanthocardia (Agnocardia) sorrentoensis" = Acanthocardia (Agnocardia) sorrentoense2 Hanna 1927 cockle
 Solenida - Solenidae
"Solena (Eosolen) navacularis" = Solena (Eosolen) novacularis1
"Solena (Eosolen) navacularis" = Solena (Eosolen) novacularis1 Anderson and Hanna 1925 clam
 Lucinida - Lucinidae
"Claibornites diegoensis" = Claibornites (Claibornites) diegoensis1
"Claibornites diegoensis" = Claibornites (Claibornites) diegoensis1 Dickerson 1916 clam
Gastropoda
 Ptenoglossa - Epitoniidae
Cirsotrema sp.1 Mörch 1852 wentletrap
 Cephalaspidea - Cylichnidae
"Cylichnina tantilla" = Cylichnella tantilla1
"Cylichnina tantilla" = Cylichnella tantilla1 Anderson and Hanna 1925 snail
 Architaenioglossa - Ampullinidae
Eocernina hannibali1 Dickerson 1914 snail
Pachycrommium clarki1 Stewart 1927 snail
 Neogastropoda - Buccinidae
Ancistrolepis carolineae n. sp.1 Squires 1984 true whelk
 Neogastropoda - Melongenidae
"Ficopsis cooperiana" = Fusus (Hemifusus) cooperii1
"Ficopsis cooperiana" = Fusus (Hemifusus) cooperii1 Gabb 1864 snail
 Neogastropoda - Fasciolariidae
Clavilithes "n. sp. B"1, "Fusinus teglandae" = Fusinus teglandi1, "Clavilithes tabulatus" = Clavella tabulata1
Clavilithes "n. sp. B"1 Swainson 1840 snail
"Fusinus teglandae" = Fusinus teglandi1 Hanna 1927 snail
"Clavilithes tabulatus" = Clavella tabulata1 Dickerson 1913 snail
 Neogastropoda - Volutidae
Lapparia eomagna2 Vokes 1939 volute
 Neogastropoda - Tudiclidae
Pseudoperissolax blakei1 Conrad 1855 snail
as Pseudoperissolax blakei praeblakei
 Neogastropoda - Harpidae
"Eocithara mutica" = Harpa mutica1
"Eocithara mutica" = Harpa mutica1 Lamarck 1803 snail
as Eocithara mutica californiensis
 Neogastropoda - Turridae
? Cochlespiropsis jenkinsi n. sp.2, "Fusiturricula (Crenaturricula) crenatospira" = Crenaturricula crenatospira1, Surculites mathewsonii1
? Cochlespiropsis jenkinsi n. sp.2 Squires 2001 turrid
"Fusiturricula (Crenaturricula) crenatospira" = Crenaturricula crenatospira1 Cooper 1894 turrid
also as Fusiturricula (Crenaturricula) crenatospira domenginica
Surculites mathewsonii1 Gabb 1864 turrid
 Neogastropoda - Conidae
Conus hornii1 Gabb 1864 cone shell
as Conus hornii umpquaensis
 Stromboidea - Strombidae
"Ectinochilus (Macilentos) macilentus" = Ectinochilus (Macilentos) macilenta1
"Ectinochilus (Macilentos) macilentus" = Ectinochilus (Macilentos) macilenta1 White 1889 true conch
 Ficoidea - Ficidae
Ficopsis remondii1 Gabb 1864 fig shell
as Ficopsis remondii crescentensis
 Naticoidea - Naticidae
Polinices (Euspira) nuciformis1 Gabb 1864 moon snail
 Cypraeoidea - Cypraeidae
Cypraea castacensis1 Stewart 1927 cowry
 Xenophoroidea - Xenophoridae
Xenophora stocki1 Dickerson 1916 carrier shell
 Tonnoidea - Ranellidae
Cymatium janetae n. sp. Squires 1983 triton shell
Cymatium (Septa) janetae1 Squires 1983 triton shell
Ranella katherineae n. sp. Squires 1983 triton shell
Ranella katherineae1 Squires 1983 triton shell
"Olequahia domenginica" = Ranella domenginica1 Vokes 1939 triton shell
 Tonnoidea - Cassidae
"Galeodea (Caliagaleodea) californica" = Galeodea californica1, "Phalium (Semicassis) tuberculiformis" = Morio (Sconsia) tuberculatus1
"Galeodea (Caliagaleodea) californica" = Galeodea californica1 Clark 1942 snail
"Phalium (Semicassis) tuberculiformis" = Morio (Sconsia) tuberculatus1 Squires 1984 snail
 Sorbeoconcha - Turritellidae
Turritella andersoni1 Dickerson 1916 turret shell
as Turritella andersoni lawsoni
Turritella uvasana1 Conrad 1865 turret shell
as Turritella uvasana applinae
 Sorbeoconcha - Brachytrematidae
Benoistia umpquaensis1 Turner 1938 snail
 Tectibranchia - Akeridae
Akera maga2 Vokes 1939 snail
 Architectonicoidea - Architectonicidae
"Architectonica (Stellaxis) cognata" = Stellaxis cognata1
"Architectonica (Stellaxis) cognata" = Stellaxis cognata1 Gabb 1864 sundial
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium stentor1 Anderson and Hanna 1925 tusk shell
Cephalopoda
 Nautilida - Aturiidae
Aturia myrlae1 Hanna 1927 nautiloid
 Nautilida - Nautilidae
Kummelonautilus sp.2 Matsumoto 1984 nautiloid
Chondrichthyes
 Lamniformes - Odontaspididae
Striatolamia macrota2 Agassiz 1843 sand tiger shark
Odontaspis sp.1 Agassiz 1843 sand tiger shark
Echinoidea
 Spatangoida - Schizasteridae
Schizaster diabloensis1 Kew 1920 heart urchin
 Spatangoida - Brissidae
Eupatagus stevensi2 Grant and Hertlein 1938 heart urchin
Anthozoa
 Scleractinia - Montlivaltiidae
"? Trochocyathus striatus" = Trochosmilia striata1
"? Trochocyathus striatus" = Trochosmilia striata1 Gabb 1864 stony coral
 Scleractinia - Oculinidae
"Archohelia clarki" = Petrophyllia clarki2
"Archohelia clarki" = Petrophyllia clarki2 Vaughan 1927 stony coral
Orthophragmina
  -
"Pseudophragmina (Proporocyclina) clarki" = Orthophragmina clarki1
"Pseudophragmina (Proporocyclina) clarki" = Orthophragmina clarki1 Cushman 1920
Bullaea
  -
"Megistostoma gabbianum" = Bullaea gabbiana1
"Megistostoma gabbianum" = Bullaea gabbiana1 Stoliczka 1868
Lyrischapa lajollaensis
  -
"Lyrischapa lajollaensis" = Pejona lajollaensis1
"Lyrischapa lajollaensis" = Pejona lajollaensis1 Hanna 1927