USGS Cenozoic M1455 San Antonio River Road (Miocene of the United States)

Also known as UCMP IP6742

Where: Monterey County, California (35.9° N, 121.1° W: paleocoordinates 34.3° N, 117.8° W)

• coordinate stated in text

When: Pancho Rico Formation, Messinian (7.2 - 5.3 Ma)

• Described in reference as Pliocene. Pancho Rico Formation is Miocene per Addicott 1978 (Geological Survey Bulletin, Issue 1457). AGE: Revised to Messian consistent with EPICC stratigraphic revision [A. Hendy, 06/2020].

Environment/lithology: marine; lithology not reported

• A westward shoaling and possible depositional limit of the Pancho Rico Formation, at least in the southwestern part of the outcrop area, is suggested by the relatively thin sequence of coarse-grained clastic rocks containing abundant mollusks indicative of shallow water.

Size class: macrofossils

Collected by D. L Durham in 1962

Primary reference: D. L. Durham and W. O. Addicott. 1965. Pancho Rico Formation, Salinas Valley. United States Geological Survey Professional Paper 524(A):A1-A22 [P. Holroyd/S. Tremblay]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 194888: authorized by Patricia Holroyd, entered by Susan Tremblay on 06.07.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Mytilida - Mytilidae
Mytilus cf. coalingensis
Mytilus cf. coalingensis Arnold 1909 mussel
 Arcida - Arcidae
Anadara cf. trilineata
Anadara cf. trilineata Conrad 1856 ark
 Pectinida - Pectinoidae
Lyropecten sp.
Lyropecten sp. Conrad 1862 scallop
 Carditida - Carditidae
"Cyclocardia cf. californica" = Coanicardita californica
"Cyclocardia cf. californica" = Coanicardita californica Dall 1903 clam
 Lucinida - Lucinidae
Here excavata, "Lucinisca "n. sp. ? aff. nuttalli"" = Lucina (Lucinisca)
Here excavata Carpenter 1857 clam
"Lucinisca "n. sp. ? aff. nuttalli"" = Lucina (Lucinisca) Dall 1901 clam
 Pholadida - Myidae
Cryptomya californica
Cryptomya californica Conrad 1837 softshell clam
 Cardiida - Cardiidae
? Clinocardium sp.
? Clinocardium sp. Keen 1936 cockle
 Cardiida - Tellinidae
"Florimetis biangulata" = Leporimetis obesa, Macoma nasuta
"Florimetis biangulata" = Leporimetis obesa Deshayes 1855 tellin clam
Macoma nasuta Conrad 1837 tellin clam
 Cardiida - Veneridae
"Chione aff. gnidia" = Chionopsis gnidia, "Protothaca cf. staminea" = Leukoma staminea, "Protothaca tenerrima" = Callithaca tenerrima
"Chione aff. gnidia" = Chionopsis gnidia Broderip and Sowerby I 1829 venus clam
"Protothaca cf. staminea" = Leukoma staminea Conrad 1837 venus clam
"Protothaca tenerrima" = Callithaca tenerrima Carpenter 1857 venus clam
 Cardiida - Mactridae
Spisula sp.
Spisula sp. Gray 1837 clam
 Solenida - Solenidae
"Solen cf. perrini" = Solena (Eosolen) perrini
"Solen cf. perrini" = Solena (Eosolen) perrini Clark 1915 clam
Gastropoda
 Opisthobranchia - Cylichnidae
Scaphander aff. jugularis
Scaphander aff. jugularis Conrad 1855 snail
 Cerithioidea - Cerithiidae
Bittium sp.
Bittium sp. Gray 1847 cerith snail
 Cerithioidea - Turritellidae
Turritella cooperi
Turritella cooperi Carpenter 1864 turret shell
 Sorbeoconcha - Naticidae
Neverita sp.
Neverita sp. Risso 1826 moon snail
 Neogastropoda - Nassariidae
"Nassarius aff. californianus" = Caesia californiana
"Nassarius aff. californianus" = Caesia californiana Conrad 1856 snail
 Neogastropoda - Cancellariidae
"Cancellaria cf. fernandoensis" = Euclia fernandoensis
"Cancellaria cf. fernandoensis" = Euclia fernandoensis Arnold 1907 snail
 Neogastropoda - Olividae
Olivella sp.
Olivella sp. Swainson 1831 olive snail
 Neotaenioglossa - Calyptraeidae
Crepidula adunca, Calyptraea sp.
Crepidula adunca Sowerby 1824 slipper shell
Calyptraea sp. Lamarck 1799 slipper shell