USGS loc. 18426, San Martinez Grande Canyon (Pliocene of the United States)

Also known as Winterer and Durham loc. F60; M 212

Where: Los Angeles County, California (34.4° N, 118.7° W)

• Paleocoordinates: 35.0° N, 117.4° W (Wright 2013)

• coordinate estimated from map

When: Pico Formation, Late/Upper Pliocene (3.6 - 2.6 Ma)

Environment/lithology: coastal; lenticular, graded, conglomeratic sandstone

• Several large faunas were collected from lenticular beds of sandstone and conglomerate in the lower part of the Pico formation north of the Santa Clara River.These collections (from loc. F41-48, F50, F51, F59,and F60) come from graded beds or from beds intimately associated with graded beds; the faunas probably were transported to their place of final deposition by turbidity currents or submarine slides.

Size class: macrofossils

Collected by Winterer in 1950; reposited in the USGS

Primary reference: E. L. Winterer and D. L. Durham. 1962. Geology of southeastern Ventura basin, Los Angeles County, California. United States Geological Survey Professional Paper 334-H:275-366more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 238580: authorized by Jonathan Marcot, entered by Jonathan Marcot on 28.01.2025

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Nuculanida - Nuculanidae
Saccella taphria
Saccella taphria Dall 1896 pointed nut clam
 Arcida - Arcidae
Anadara trilineata
Anadara trilineata Conrad 1856 ark
doubtful occurrence
 Pectinida - Pectinoidae
"Pecten cf. stearnsii" = Leopecten stearnsii, "Chlamys islandicus hindsii" = Chlamys rubida, Chlamys opuntia, Lyropecten catalinae, "Aequipecten cf. purpuratus" = Argopecten purpuratus, Patinopecten healeyi
"Pecten cf. stearnsii" = Leopecten stearnsii Dall 1878 scallop
"Chlamys islandicus hindsii" = Chlamys rubida Hinds 1845 scallop
Chlamys opuntia Dall 1898 scallop
Lyropecten catalinae Arnold 1906 scallop
"Aequipecten cf. purpuratus" = Argopecten purpuratus Lamarck 1819 calico scallop
Patinopecten healeyi Arnold 1906 scallop
doubtful occurrence
 Pectinida - Anomiidae
"Pododesmus macroschisma" = Pododesmus (Monia) macrochisma
"Pododesmus macroschisma" = Pododesmus (Monia) macrochisma Deshayes 1839 scallop
doubtful occurrence
 Ostreida - Ostreidae
Myrakeena veatchii
Myrakeena veatchii Gabb 1866 oyster
"strongly plicate form"
 Lucinida - Lucinidae
"Lucina cf. excavata" = Here excavata, "Lucinoma cf. annulata" = Lucinoma annulatum
"Lucina cf. excavata" = Here excavata Carpenter 1857 clam
"Lucinoma cf. annulata" = Lucinoma annulatum Reeve 1850 clam
 Solenida - Solenidae
"Solen cf. perrini" = Solena (Eosolen) perrini
"Solen cf. perrini" = Solena (Eosolen) perrini Clark 1915 clam
 Cardiida - Cardiidae
"Trachycardium cf. quadragenarium" = Dallocardia quadragenarium
"Trachycardium cf. quadragenarium" = Dallocardia quadragenarium Conrad 1837 cockle
 Cardiida - Tellinidae
"Macoma cf. calcarea" = Macoma (Macoma) calcarea
"Macoma cf. calcarea" = Macoma (Macoma) calcarea Gmelin 1792 tellin clam
"small form"
 Cardiida - Mactridae
"Spisula ? hemphilli" = Mactromeris hemphillii
"Spisula ? hemphilli" = Mactromeris hemphillii Dall 1894 clam
 Cardiida - Veneridae
"Chione fernandoensis" = Chione (Anomalocardia) fernandoensis
"Chione fernandoensis" = Chione (Anomalocardia) fernandoensis English 1914 venus clam
Scaphopoda
 Dentaliida - Dentaliidae
? Dentalium sp.
? Dentalium sp. Linnaeus 1758 tusk shell
Gastropoda
 Cerithioidea - Turritellidae
Turritella cooperi
Turritella cooperi Carpenter 1864 turret shell
 Neogastropoda - Siphonaliidae
Calicantharus cf. humerosus
 Neogastropoda - Volutidae
Fulgoraria cf. oregonensis
 Sorbeoconcha - Naticidae
"Neverita reclusiana" = Glossaulax reclusiana
"Neverita reclusiana" = Glossaulax reclusiana Deshayes 1839 moon snail
 Neotaenioglossa - Calyptraeidae
Calyptraea filosa, Crepidula onyx
Calyptraea filosa Gabb 1866 slipper shell
Crepidula onyx Sowerby 1824 slipper shell
doubtful occurrence