USGS M1720, San Francisco Peninsula (Pliocene of the United States)

Where: Santa Clara County, California (37.4° N, 122.2° W: paleocoordinates 37.2° N, 121.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From the Merced Fm, which overlies the Monterey Shale (Miocene). AGE: Late Pliocene, on the basis of macrofossil biostratigraphy. STRATIGRAPHIC POSITION: From the basal Merced Fm, immediately above contact with Monterey Shale.

• bed-level stratigraphic resolution

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

• SPECIFIC LITHOLOGY: Fossiliferous sandstone. LITHIFICATION: Unlithified, on the basis of figured specimens.

Size class: macrofossils

• TAPHONOMY: Bed consists principally of broken pelecypod shells.

Collected by Addicott in 1962-1963

Collection methods: surface (in situ),

• COLLECTOR: W.O. Addicott and others, 1962-1963. REPOSITORY: Then USGS, now probably at CAS or UCMP.

Primary reference: W. O. Addicott. 1969. Late Pliocene mollusks from San Francisco Peninsula, California, and their paleogeographic significance. Proceedings of the California Academy of Sciences 37(3):57-93 [A. Hendy/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 96572: authorized by Austin Hendy, entered by Austin Hendy on 12.06.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for molluscs. NOMENCLATURE: Not an authoritative publication, with somewhat antiquated nomenclature, but species-resolution identifications.
Bivalvia
 Solenida - Solenidae
Solen cf. sicarius Gould 1850 clam
 Cardiida - Veneridae
"Protothaca staleyi" = Leukoma staleyi
"Protothaca staleyi" = Leukoma staleyi Gabb 1866 venus clam
 Cardiida - Mactridae
"Spisula albaria" = Mactromeris albaria
"Spisula albaria" = Mactromeris albaria Conrad 1848 clam
 Pholadida - Myidae
Cryptomya californica Conrad 1837 softshell clam
 Arcida - Arcidae
"Anadara (Anadara) trilineata" = Anadara trilineata
"Anadara (Anadara) trilineata" = Anadara trilineata Conrad 1856 ark
Gastropoda
 Neogastropoda - Columbellidae
"Mitrella cf. gouldii" = Mitrella gausapata
"Mitrella cf. gouldii" = Mitrella gausapata Gould 1850 snail
 Neogastropoda - Nassariidae
Nassarius (Caesia) grammatus, "Nassarius (Demondia) californianus" = Caesia californiana
"Nassarius (Demondia) californianus" = Caesia californiana Conrad 1856 snail
 Neogastropoda - Olividae
"Olivella biplicata" = Callianax biplicata
"Olivella biplicata" = Callianax biplicata Sowerby 1825 olive snail
 Sorbeoconcha - Naticidae
"Cryptonatica aleutica" = Cryptonatica affinis
"Cryptonatica aleutica" = Cryptonatica affinis Gmelin 1791 moon snail