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
Echinoidea
 Clypeasteroida - Echinarachniidae
Astrodapsis sp., Astrodapsis spatiosus
Astrodapsis sp. Conrad 1856 sand dollar
Astrodapsis spatiosus Kew 1920 sand dollar
 Clypeasteroida - Dendrasteridae
Dendraster sp.
Dendraster sp. Agassiz and Desor 1847 sand dollar
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. nummaria, Crepidula cf. onyx, Crucibulum "n. sp. ?"
Crepidula cf. nummaria Gould 1846 slipper shell
Crepidula cf. onyx Sowerby 1824 slipper shell
Crucibulum "n. sp. ?" Schumacher 1817 slipper shell
 Sorbeoconcha - Procerithiidae
"Bittium casmaliense" = Lirobittium casmaliense
"Bittium casmaliense" = Lirobittium casmaliense Bartsch 1911 snail
 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
 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 - Siphonaliidae
Calicantharus cf. humerosus, Calicantharus kettlemanensis, Calicantharus cf. fortis
Calicantharus cf. fortis Carpenter 1866 snail
forma angulata
 Neogastropoda - Cancellariidae
"Cancellaria cf. fernandoensis" = Euclia fernandoensis
"Cancellaria cf. fernandoensis" = Euclia fernandoensis Arnold 1907 snail
 Neogastropoda - Turridae
Megasurcula "n. sp. aff. wynoocheensis"
 Neogastropoda - Muricidae
Ocenebra cf. tethys, Forreria belcheri
Forreria belcheri Hinds 1843 murex snail
Bivalvia
 Nuculanida - Yoldiidae
Yoldia sp.
Yoldia sp. Möller 1842 clam
Field identification.
 Pectinida - Pectinoidae
Lyropecten terminus
Lyropecten terminus Arnold 1906 scallop
 Ostreida - Ostreidae
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii Gabb 1866 oyster
 Arcida - Glycymerididae
Glycymeris cf. grewinki
 Cardiida - Cardiidae
"Trachycardium quadragenarium" = Dallocardia quadragenarium
"Trachycardium quadragenarium" = Dallocardia quadragenarium Conrad 1837 cockle
 Cardiida - Tellinidae
"Florimetis biangulata" = Leporimetis obesa, "Tellina cf. lutea" = Tellina (Megangulus) lutea, "Tellina cf. aragonia" = Tellina (Peronidia) aragonia, "Macoma secta" = Rexithaerus secta, Macoma nasuta
"Florimetis biangulata" = Leporimetis obesa Deshayes 1855 tellin clam
"Tellina cf. lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam
"Tellina cf. aragonia" = Tellina (Peronidia) aragonia Dall 1909 tellin clam
"Macoma secta" = Rexithaerus secta Conrad 1837 tellin clam
Macoma nasuta Conrad 1837 tellin clam
 Cardiida - Psammobiidae
"Sanguinolaria cf. nuttalli" = Nuttallia nuttallii
"Sanguinolaria cf. nuttalli" = Nuttallia nuttallii Conrad 1837 clam
 Cardiida - Veneridae
"Protothaca cf. laciniata" = Leukoma laciniata, "? Protothaca tenerrima" = Callithaca tenerrima, "Transenella tantilla" = Nutricola tantilla
"Protothaca cf. laciniata" = Leukoma laciniata Carpenter 1864 venus clam
subsp. hannibali
"? Protothaca tenerrima" = Callithaca tenerrima Carpenter 1857 venus clam
"Transenella tantilla" = Nutricola tantilla Gould 1853 venus clam
 Cardiida - Mactridae
"Spisula hemphilli" = Mactromeris hemphillii
"Spisula hemphilli" = Mactromeris hemphillii Dall 1894 clam
 Solenida - Solenidae
Solen sp.
Solen sp. Linnaeus 1758 clam
 Carditida - Carditidae
"Cyclocardia californica" = Coanicardita californica, Glans "n. sp. aff radiata"
"Cyclocardia californica" = Coanicardita californica Dall 1903 clam
Glans "n. sp. aff radiata" Mühfeld 1811 clam
Thecostraca
 Balanomorpha - Balanidae
Balanus sp.
Balanus sp. Da Costa 1778 barnacle