USGS Cenozoic M977 Pancho Rico Creek (Miocene of the United States)

Also known as UCMP IP6655, USGS Cenozoic M1939

Where: Monterey County, California (36.0° N, 120.9° W: paleocoordinates 35.3° 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; massive, diatomaceous mudstone

• Massive diatomaceous mudstone at fossil locality M977, on south bank of Pancho Rico Creek. Dark band just above pick is sandy fossiliferous layer that grades into

•the adjacent mudstone. The beds are nearly flat.

Size class: macrofossils

Collected by D. L Durham in 1960

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 194801: authorized by Patricia Holroyd, entered by Susan Tremblay on 29.06.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Arcidae
"Anadara cf. trilineata" = Anadara (Anadara) trilineata
"Anadara cf. trilineata" = Anadara (Anadara) trilineata Conrad 1856 ark
 Pectinida - Pectinoidae
Lyropecten terminus scallop
Occurrence in collection numbered M1939 from same locality
 Ostreida - Ostreidae
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii Gabb 1866 oyster
Occurrence in collection numbered M1939 from same locality
 Cardiida - Veneridae
"Protothaca tenerrima" = Callithaca tenerrima, "? Transenella tantilla" = Nutricola tantilla
"Protothaca tenerrima" = Callithaca tenerrima Carpenter 1857 venus clam
Occurrence in collection numbered M1939 from same locality
"? Transenella tantilla" = Nutricola tantilla Gould 1853 venus clam
 Cardiida - Tellinidae
"Florimetis biangulata" = Psammotreta (Leporimetis) obesa, "Macoma indentata" = Macoma (Rexithaerus) indentata
"Florimetis biangulata" = Psammotreta (Leporimetis) obesa Deshayes 1855 tellin clam
Occurrence in collection numbered M1939 from same locality
"Macoma indentata" = Macoma (Rexithaerus) indentata Carpenter 1864 tellin clam
 Cardiida - Semelidae
Cumingia californica Conrad 1837 clam
 Cardiida - Cardiidae
"? Trachycardium quadragenarium" = Trachycardium (Dallocardia) quadragenarium
"? Trachycardium quadragenarium" = Trachycardium (Dallocardia) quadragenarium Conrad 1837 cockle
 Solenida - Solenidae
"Solen perrini" = Solena (Eosolen) perrini
"Solen perrini" = Solena (Eosolen) perrini Clark 1915 clam
Occurrence in collection numbered M1939 from same locality
 Lucinida - Lucinidae
Gastropoda
  - Siphonaliidae
 Neogastropoda - Nassariidae
Nassarius sp. Duméril 1806 snail
 Neogastropoda - Muricidae
Forreria belcheri murex snail
Ocenebra sp. Leach in Gray 1847 murex snail
 Naticoidea - Naticidae
"Neverita recluziana" = Glossaulax reclusiana
"Neverita recluziana" = Glossaulax reclusiana Deshayes 1841 moon snail
Occurrence in collection numbered M1939 from same locality
 Calyptraeoidea - Calyptraeidae
Crucibulum "n. sp. ?" Schumacher 1817 slipper shell
Calyptraea filosa Gabb 1866 slipper shell
Crepidula cf. onyx Sowerby 1824 slipper shell
Occurrence in collection numbered M1939 from same locality
 Sorbeoconcha - Turritellidae
Turritella vanvlecki turret shell
Occurrence in collection numbered M1939 from same locality
Turritella "n. sp. ?" Lamarck 1799 turret shell
Turritella cooperi Carpenter 1864 turret shell
 Fissurelloidea - Fissurellidae
 Trochoidea - Trochidae
Margarites aff. pupillus top snail
Occurrence in collection numbered M1939 from same locality