Recent Formation, San Pedro [of Conrad, 1855] (Pleistocene of the United States)

Where: Los Angeles County, California (33.7° N, 118.3° W: paleocoordinates 33.7° N, 118.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Palos Verdes Sand Formation, Late/Upper Pleistocene (0.1 - 0.0 Ma)

• LITHOSTRATIGRAPHY: No lithostratigraphy at the time of publishing, but likely that occurrences were derived from what is now understood to be the Palos Verdes Sand (late Pleistocene: AGE: Late Pleistocene (1.25-0.08 Ma) based on current understanding of chronostratigraphy for the Palos Verdes Sand. STRATIGRAPHIC RESOLUTION: List is likely derived from a single stratigraphic unit (albeit unnamed), so assigned to formation resolution.

• formation-level stratigraphic resolution

Environment/lithology: coastal; unlithified, shelly/skeletal sandstone

• ENVIRONMENT: Not stated, but based on current understanding of the unit likely collected the list represents a nearshore through inner shelf siliciclastic depositional setting.
• SPECIFIC LITHOLOGY: Unknown, but based on likely collecting locality it would have been from a sand. LITHIFICATION: Unknown, but based on likely collecting locality would have been unlithified.

Size classes: macrofossils, mesofossils

Preservation: original aragonite, original calcite

Collected by Blake; reposited in the ANSP

• COLLECTOR: Presumably W. Blake. REPOSITORY: ANSP.

Primary reference: T. A. Conrad. 1855. Report Of Mr. T. A. Conrad On The Fossil Shells Collected In California By Wm. P. Blake, Geologist Of The Expedition Under The Command Of Lieutenant R. S. Williamson, United States Topographical Engineers. Description of the fossils and shells collected in California by William P. Blake, Geologist of the United States Pacific Railroad Survey in California. under the command of Lieut. R. S. Williamson, In 1853-54. Article 1 of Appendix to the Preliminary Geological Report of WIlliam P. Blake, Geologist of the Survey in California Under the Command of Lieut. R. S. Williamson. Palæontology 5-21 [J. Marcot/J. Marcot]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 222650: authorized by Austin Hendy, entered by Austin Hendy on 11.10.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

• TAXONOMIC COVERAGE: Limited to a few described taxa, which may originate from multiple localities and stratigraphic units. NOMENCLATURE: Antiquated, but resolved to species resolution.
Bivalvia
 Pholadida - Pholadidae
"Penitella speloeum n. sp." = Penitella penita
"Penitella speloeum n. sp." = Penitella penita Conrad 1837 clam
 Cardiida - Veneridae
"Tapes diversum" = Leukoma staminea, "Saxicava abrupta n. sp." = Petricola (Petricola) carditoides, "Petricola pedroana n. sp." = Petricola (Petricola) carditoides
"Tapes diversum" = Leukoma staminea Conrad 1837 venus clam
"Saxicava abrupta n. sp." = Petricola (Petricola) carditoides Conrad 1837 venus clam
"Petricola pedroana n. sp." = Petricola (Petricola) carditoides Conrad 1837 venus clam
 Cardiida - Mactridae
"Schizothaerus nuttalli n. sp." = Tresus nuttallii
"Schizothaerus nuttalli n. sp." = Tresus nuttallii Conrad 1837 clam
 Mytilida - Mytilidae
"Mytilus pedroanus n. sp." = Mytilus trossulus
"Mytilus pedroanus n. sp." = Mytilus trossulus Gould 1850 mussel
Gastropoda
 Lepetellida - Fissurellidae
"Fissurella crenulata" = Megathura crenulata
"Fissurella crenulata" = Megathura crenulata Sowerby 1825 snail
 Neogastropoda - Olividae
"Strephona pedroana n. sp." = Callianax pedroana, "Oliva pedroensis n. sp." = Callianax pedroana
"Strephona pedroana n. sp." = Callianax pedroana Conrad 1855 olive snail
"Oliva pedroensis n. sp." = Callianax pedroana Conrad 1855 olive snail
 Neogastropoda - Columbellidae
"Nassa pedroana n. sp." = Mitrella gausapata
"Nassa pedroana n. sp." = Mitrella gausapata Gould 1850 snail
 Neogastropoda - Nassariidae
"Nassa intastriata n. sp." = Caesia perpinguis
"Nassa intastriata n. sp." = Caesia perpinguis Hinds 1844 snail
 Sorbeoconcha - Littorinidae
"Littorina pedroana n. sp." = Lacuna (Epheria) unifasciata
"Littorina pedroana n. sp." = Lacuna (Epheria) unifasciata Carpenter 1857 periwinkle
 Cerithioidea - Acanthonematidae
Turritella pedroana n. sp. turret shell