USGS loc. 18435, south of San Martinez Grande Canyon (Pliocene of the United States)

Also known as Winterer and Durham loc. F42; M 304

Where: Los Angeles County, California (34.4° N, 118.7° W: paleocoordinates 34.3° N, 117.8° W)

• 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 238434: authorized by Jonathan Marcot, entered by Jonathan Marcot on 24.01.2025

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Procerithiidae
"Bittium rugatum" = Lirobittium rugatum
"Bittium rugatum" = Lirobittium rugatum Carpenter 1866 snail
doubtful occurrence
 Sorbeoconcha - Naticidae
"Neverita reclusiana" = Glossaulax reclusiana
"Neverita reclusiana" = Glossaulax reclusiana Deshayes 1839 moon snail
 Neogastropoda - Buccinidae
"Nassa" sp.
"Nassa" sp. Röding 1798 true whelk
doubtful occurrence
 Cerithioidea - Turritellidae
"Turritella cf. gonostoma hemphilli" = Turritella vanvlecki hemphilli, Turritella cooperi
"Turritella cf. gonostoma hemphilli" = Turritella vanvlecki hemphilli Applin 1920 turret shell
Turritella cooperi Carpenter 1864 turret shell
 Trochoidea - Trochidae
"Tegula gallina" = Chlorostoma gallina
"Tegula gallina" = Chlorostoma gallina Forbes 1850 top snail
Bivalvia
 Nuculanida - Nuculanidae
Saccella taphria
Saccella taphria Dall 1896 pointed nut clam
 Ostreida - Ostreidae
"Ostrea vespertina" = Dendostrea vespertina
"Ostrea vespertina" = Dendostrea vespertina Conrad 1855 oyster
 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"; doubtful occurrence
 Cardiida - Veneridae
"Chione fernandoensis" = Chione (Anomalocardia) fernandoensis, Dosinia ponderosa
"Chione fernandoensis" = Chione (Anomalocardia) fernandoensis English 1914 venus clam
Dosinia ponderosa Gray 1838 venus clam
 Lucinida - Lucinidae
"Lucinisca nuttallii" = Lucinisca nuttalli
"Lucinisca nuttallii" = Lucinisca nuttalli Conrad 1837 clam
 Carditida - Carditidae
"Cyclocardia aff. barbarensis" = Hippocampocardia barbarensis
"Cyclocardia aff. barbarensis" = Hippocampocardia barbarensis Stearns 1890 clam