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 35.7° N, 119.0° 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; 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

Show authors, comments, and common names
Gastropoda
 Neotaenioglossa - Calyptraeidae
Crepidula cf. onyx, Crucibulum "n. sp. ?", Calyptraea filosa
Crepidula cf. onyx Sowerby 1824 slipper shell
Occurrence in collection numbered M1939 from same locality
Crucibulum "n. sp. ?" Schumacher 1817 slipper shell
Calyptraea filosa Gabb 1866 slipper shell
 Cerithioidea - Turritellidae
Turritella "n. sp. ?", Turritella cooperi, Turritella vanvlecki
Turritella "n. sp. ?" Lamarck 1799 turret shell
Turritella cooperi Carpenter 1864 turret shell
Turritella vanvlecki Arnold 1909 turret shell
Occurrence in collection numbered M1939 from same locality
 Sorbeoconcha - Naticidae
"Neverita recluziana" = Glossaulax reclusiana
"Neverita recluziana" = Glossaulax reclusiana Deshayes 1839 moon snail
Occurrence in collection numbered M1939 from same locality
 Neogastropoda - Siphonaliidae
Calicantharus kettlemanensis, Calicantharus cf. fortis
Calicantharus cf. fortis Carpenter 1866 snail
 Neogastropoda - Nassariidae
Nassarius sp., Nassarius salinasensis
Nassarius sp. Duméril 1806 snail
Nassarius salinasensis Addicott 1965 snail
 Neogastropoda - Muricidae
Ocenebra sp., ? Ocenebra cf. tethys, Forreria belcheri
Ocenebra sp. Leach in Gray 1847 murex snail
Forreria belcheri Hinds 1843 murex snail
 Trochoidea - Turbinidae
"Margarites aff. pupillus" = Pupillaria pupilla
"Margarites aff. pupillus" = Pupillaria pupilla Gould 1849 snail
Occurrence in collection numbered M1939 from same locality
 Lepetellida - Fissurellidae
Diodora "n. sp.? aff. inaequalis"
Bivalvia
 Solenida - Solenidae
"Solen perrini" = Solena (Eosolen) perrini
"Solen perrini" = Solena (Eosolen) perrini Clark 1915 clam
Occurrence in collection numbered M1939 from same locality
 Cardiida - Veneridae
"? Transenella tantilla" = Nutricola tantilla, "Protothaca tenerrima" = Callithaca tenerrima
"? Transenella tantilla" = Nutricola tantilla Gould 1853 venus clam
"Protothaca tenerrima" = Callithaca tenerrima Carpenter 1857 venus clam
Occurrence in collection numbered M1939 from same locality
 Cardiida - Tellinidae
"Macoma indentata" = Macoma (Rexithaerus) indentata, "Florimetis biangulata" = Leporimetis obesa
"Macoma indentata" = Macoma (Rexithaerus) indentata Carpenter 1864 tellin clam
"Florimetis biangulata" = Leporimetis obesa Deshayes 1855 tellin clam
Occurrence in collection numbered M1939 from same locality
 Cardiida - Semelidae
Cumingia californica
Cumingia californica Conrad 1837 clam
 Cardiida - Cardiidae
"? Trachycardium quadragenarium" = Dallocardia quadragenarium
"? Trachycardium quadragenarium" = Dallocardia quadragenarium Conrad 1837 cockle
 Lucinida - Lucinidae
"Lucinisca "n. sp.? aff. nuttalli"" = Lucina (Lucinisca)
"Lucinisca "n. sp.? aff. nuttalli"" = Lucina (Lucinisca) Dall 1901 clam
 Pectinida - Pectinoidae
Lyropecten terminus
Lyropecten terminus Arnold 1906 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
 Arcida - Arcidae
Anadara cf. trilineata
Anadara cf. trilineata Conrad 1856 ark