USGS Cenozoic M1935 Walker Canyon (Miocene of the United States)

Also known as UCMP IP6939

Where: Monterey County, California (36.0° N, 120.8° W: paleocoordinates 35.6° N, 118.9° 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

• Medium- and coarse-grained sandstone, locally pebbly, and interbedded mudstone. The ledgeforming bed at the top of the outcrop contains abundant fossil echinoids.

Size class: macrofossils

Collected by D. L Durham, W. O. Addicott in 1963

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 194895: 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
Gastropoda
 Neogastropoda - Siphonaliidae
Calicantharus cf. fortis angulata
Bivalvia
 Carditida - Carditidae
Glans aff radiata
 Cardiida - Veneridae
Protothaca cf. laciniata hannibali
Gastropoda
 Trochoidea - Turbinidae
"Margarites aff. pupillus" = Pupillaria pupilla
"Margarites aff. pupillus" = Pupillaria pupilla Gould 1849 snail
 Cerithioidea - Turritellidae
Turritella vanvlecki
Turritella vanvlecki Arnold 1909 turret shell
 Neotaenioglossa - Calyptraeidae
Crepidula cf. onyx, Crepidula cf. nummaria, Crucibulum sp.
Crepidula cf. onyx Sowerby 1824 slipper shell
Crepidula cf. nummaria Gould 1846 slipper shell
Crucibulum sp. Schumacher 1817 slipper shell
 Sorbeoconcha - Procerithiidae
"Bittium casmaliense" = Lirobittium casmaliense
"Bittium casmaliense" = Lirobittium casmaliense Bartsch 1911 snail
 Neogastropoda - Muricidae
Ocinebra cf. tethys, Forreria belcheri
Ocinebra cf. tethys Nomland 1917 murex snail
as "Ocenebra cf. tethys"
Forreria belcheri Hinds 1843 murex snail
 Neogastropoda - Siphonaliidae
Calicantharus cf. humerosus, Calicantharus kettlemanensis
Calicantharus kettlemanensis Arnold 1909 snail
 Neogastropoda - Columbellidae
Mitrella sp.
Mitrella sp. Risso 1826 snail
 Neogastropoda - Nassariidae
"Nassarius cf. californianus" = Caesia californiana
"Nassarius cf. californianus" = Caesia californiana Conrad 1856 snail
 Neogastropoda - Cancellariidae
"Cancellaria cf. fernandoensis" = Euclia fernandoensis
"Cancellaria cf. fernandoensis" = Euclia fernandoensis Arnold 1907 snail
 Neogastropoda - Turridae
Megasurcula aff. wynoocheensis
 Sorbeoconcha - Naticidae
"Neverita cf. recluziana" = Glossaulax reclusiana, Sinum cf. scopulosum
"Neverita cf. recluziana" = Glossaulax reclusiana Deshayes 1839 moon snail
Sinum cf. scopulosum Conrad 1849 moon snail
Bivalvia
 Nuculanida - Yoldiidae
Yoldia sp.
Yoldia sp. Möller 1842 clam
Field identification.
 Cardiida - Cardiidae
"Trachycardium quadragenarium" = Dallocardia quadragenarium
"Trachycardium quadragenarium" = Dallocardia quadragenarium Conrad 1837 cockle
 Cardiida - Psammobiidae
"Sanguinolaria cf. nuttalli" = Nuttallia nuttallii
"Sanguinolaria cf. nuttalli" = Nuttallia nuttallii Conrad 1837 clam
 Cardiida - Tellinidae
"Florimetis biangulata" = Leporimetis obesa, Macoma nasuta, "Macoma secta" = Rexithaerus secta, "Tellina cf. aragonia" = Tellina (Peronidia) aragonia, "Tellina cf. lutea" = Tellina (Megangulus) lutea
"Florimetis biangulata" = Leporimetis obesa Deshayes 1855 tellin clam
Macoma nasuta Conrad 1837 tellin clam
"Macoma secta" = Rexithaerus secta Conrad 1837 tellin clam
"Tellina cf. aragonia" = Tellina (Peronidia) aragonia Dall 1909 tellin clam
"Tellina cf. lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam
 Cardiida - Mactridae
"Spisula hemphilli" = Mactromeris hemphillii
"Spisula hemphilli" = Mactromeris hemphillii Dall 1894 clam
 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
 Solenida - Solenidae
Solen sp.
Solen sp. Linnaeus 1758 clam
 Carditida - Carditidae
"Cyclocardia californica" = Coanicardita californica
"Cyclocardia californica" = Coanicardita californica Dall 1903 clam
 Arcida - Glycymerididae
Glycymeris cf. grewingki
Glycymeris cf. grewingki Dall 1909 clam
misspelled as "Glycymeris cf. grewinki"
 Ostreida - Ostreidae
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii Gabb 1866 oyster
 Pectinida - Pectinoidae
Lyropecten terminus
Lyropecten terminus Arnold 1906 scallop
Thecostraca
 Balanomorpha - Balanidae
Balanus sp., Balanus gregarius
Balanus sp. Da Costa 1778 barnacle
Balanus gregarius Conrad 1856 barnacle
Echinoidea
 Clypeasteroida - Dendrasteridae
Dendraster sp.
Dendraster sp. Agassiz and Desor 1847 sand dollar
 Clypeasteroida - Echinarachniidae
Astrodapsis sp., Astrodapsis spatiosus
Astrodapsis sp. Conrad 1856 sand dollar
Astrodapsis spatiosus Kew 1920 sand dollar