USGS Cenozoic M2050 San Luis Obispo (Miocene of the United States)

Also known as UCMP IP7046

Where: Monterey County, California (35.7° N, 120.8° W: paleocoordinates 35.0° N, 116.5° W)

• coordinate stated in text

When: Pancho Rico Formation, Miocene (23.0 - 5.3 Ma)

• Described in reference as Pliocene. Pancho Rico Formation is Miocene per Addicott 1978 (Geological Survey Bulletin, Issue 1457).

Environment/lithology: marine; lithology not reported

• relatively thin sequence of coarse-grained clastic rocks containing abundant mollusks indicative of shallow water.

Size class: macrofossils

Collected by D. L Durham, W. O. Addicott in 1964

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 195034: authorized by Patricia Holroyd, entered by Susan Tremblay on 12.07.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Arcida - Glycymerididae
Glycymeris sp.
Glycymeris sp. Da Costa 1778 clam
 Pectinida - Pectinoidae
"Lyropecten estrellanus" = Nodipecten estrellanus
"Lyropecten estrellanus" = Nodipecten estrellanus Conrad 1856 scallop
 Mytilida - Mytilidae
Modiolus sp.
Modiolus sp. Lamarck 1801 mussel
 Pholadida - Myidae
Cryptomya californica
Cryptomya californica Conrad 1837 softshell clam
 Cardiida - Mactridae
Spisula sp.
Spisula sp. Gray 1837 clam
 Cardiida - Veneridae
"Protothaca sp." = Leukoma
"Protothaca sp." = Leukoma Römer 1857 venus clam
 Cardiida - Tellinidae
"Florimetis biangulata" = Psammotreta (Leporimetis) obesa, "? Macoma indentata" = Macoma (Rexithaerus) indentata, Macoma nasuta
"Florimetis biangulata" = Psammotreta (Leporimetis) obesa Deshayes 1855 tellin clam
"? Macoma indentata" = Macoma (Rexithaerus) indentata Carpenter 1864 tellin clam
Macoma nasuta Conrad 1837 tellin clam
 Solenida - Solenidae
"? Solen perrini" = Solena (Eosolen) perrini
"? Solen perrini" = Solena (Eosolen) perrini Clark 1915 clam
Gastropoda
  - Siphonaliidae
Calicantharus cf. fortis
Calicantharus cf. fortis Carpenter 1866 snail
 Neogastropoda - Nassariidae
"Nassarius aff. californianus" = Caesia californiana
"Nassarius aff. californianus" = Caesia californiana Conrad 1856 snail
 Neogastropoda - Drilliidae
Clavus coalingensis
Clavus coalingensis Arnold 1910 snail
 Neogastropoda - Turridae
Crassispira "n. sp.? aff. martinensis"
 Naticoidea - Naticidae
Polinices lewisi
Polinices lewisi moon snail
 Calyptraeoidea - Calyptraeidae
Calyptraea filosa, Crepidula adunca
Calyptraea filosa Gabb 1866 slipper shell
Crepidula adunca Sowerby 1824 slipper shell
 Sorbeoconcha - Turritellidae
Turritella gonostoma, Turritella cooperi
Turritella gonostoma Valenciennes 1832 turret shell
hemphilli
Turritella cooperi Carpenter 1864 turret shell
 Sorbeoconcha - Procerithiidae
"? Bittium casmaliense" = Lirobittium casmaliense
"? Bittium casmaliense" = Lirobittium casmaliense Bartsch 1911 snail
 Trochoidea - Trochidae
Margarites cf. condoni