USGS Cenozoic M1935 Walker Canyon: Messinian, California
collected by D. L Durham, W. O. Addicott 1963

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea - Clypeasteroida - Echinarachniidae
Astrodapsis sp. Conrad 1856
Astrodapsis spatiosus (Kew 1920)
Echinoidea - Clypeasteroida - Dendrasteridae
Dendraster sp. Agassiz and Desor 1847
Gastropoda - Turbinidae
Margarites aff. pupillus (Gould 1849)
recombined as Pupillaria pupilla
Gastropoda - Neogastropoda - Muricidae
Forreria belcheri (Hinds 1843)
Ocinebra cf. tethys Nomland 1917
as "Ocenebra cf. tethys"
Gastropoda - Neogastropoda - Turridae
Megasurcula informal n. sp. aff. wynoocheensis
Gastropoda - Neogastropoda - Columbellidae
Mitrella sp. Risso 1826
Gastropoda - Neogastropoda - Siphonaliidae
Calicantharus kettlemanensis (Arnold 1909)
Calicantharus cf. humerosus (Gabb 1869)
Calicantharus cf. fortis (Carpenter 1866)
forma angulata
Gastropoda - Neogastropoda - Nassariidae
Nassarius cf. californianus (Conrad 1856)
recombined as Caesia californiana
Gastropoda - Neogastropoda - Cancellariidae
Cancellaria cf. fernandoensis Arnold 1907
recombined as Euclia fernandoensis
Gastropoda - Naticidae
Neverita cf. recluziana (Deshayes 1839)
recombined as Glossaulax reclusiana
Sinum cf. scopulosum (Conrad 1849)
recombined as Sinum scopulosus
Gastropoda - Procerithiidae
Bittium casmaliense Bartsch 1911
recombined as Lirobittium casmaliense
Gastropoda - Neotaenioglossa - Calyptraeidae
Crucibulum informal n. sp. ?
Crepidula cf. onyx Sowerby 1824
Crepidula cf. nummaria Gould 1846
Gastropoda - Turritellidae
Turritella vanvlecki Arnold 1909
Bivalvia - Solenida - Solenidae
Solen sp. Linnaeus 1758
Bivalvia - Cardiida - Veneridae
Transenella tantilla (Gould 1853)
recombined as Nutricola tantilla
Protothaca cf. laciniata (Carpenter 1864)
recombined as Leukoma laciniata
subsp. hannibali
? Protothaca tenerrima (Carpenter 1857)
recombined as Callithaca tenerrima
Bivalvia - Cardiida - Mactridae
Spisula hemphilli (Dall 1894)
recombined as Mactromeris hemphillii
Bivalvia - Cardiida - Tellinidae
Florimetis biangulata (Carpenter 1856)
synonym of Leporimetis obesa
Macoma secta (Conrad 1837)
recombined as Rexithaerus secta
Macoma nasuta (Conrad 1837)
Tellina cf. aragonia Dall 1909
recombined as Tellina (Peronidia) aragonia
Tellina cf. lutea Gray 1828
recombined as Tellina (Megangulus) lutea
Bivalvia - Cardiida - Psammobiidae
Sanguinolaria cf. nuttalli (Conrad 1837)
recombined as Nuttallia nuttallii
Bivalvia - Cardiida - Cardiidae
Trachycardium quadragenarium (Conrad 1837)
recombined as Dallocardia quadragenarium
Bivalvia - Carditida - Carditidae
Glans informal n. sp. aff radiata
Cyclocardia californica (Dall 1903)
recombined as Coanicardita californica
Bivalvia - Pectinida - Pectinidae
Lyropecten terminus (Arnold 1906)
Bivalvia - Ostreida - Ostreidae
Ostrea atwoodi (Gabb 1866)
recombined as Ostrea (Ostrea) atwoodii
Bivalvia - Arcida - Glycymerididae
Glycymeris cf. grewingki Dall 1909
misspelled as "Glycymeris cf. grewinki"
Bivalvia - Nuculanida - Yoldiidae
Yoldia sp. Möller 1842
Field identification.
Thecostraca - Balanomorpha - Balanidae
Balanus sp. Da Costa 1778
Balanus gregarius (Conrad 1856)
original and current combination Tamiosoma gregaria
see common names

Geography
Country:United States State/province:California County:Monterey
Coordinates: 36.0° North, 120.8° West (view map)
Paleocoordinates:35.6° North, 118.9° West
Basis of coordinate:stated in text
Time
Period:Neogene Epoch:Miocene
Stage:Messinian 10 m.y. bin:Cenozoic 6
Key time interval:Messinian
Age range of interval:7.24600 - 5.33300 m.y. ago
Stratigraphy
Formation:Pancho Rico
Stratigraphy comments: 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].
Lithology and environment
Primary lithology: not reported
Lithology description: Medium- and coarse-grained sandstone, locally pebbly, and interbedded mudstone. The ledgeforming bed at the top of the outcrop contains abundant fossil echinoids.
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Collectors:D. L Durham, W. O. Addicott Collection dates:1963
Metadata
Also known as:UCMP IP6939
Database number:194895
Authorizer:P. Holroyd Enterer:S. Tremblay
Modifier:A. Hendy Research group:marine invertebrate
Created:2018-07-06 14:59:40 Last modified:2020-06-16 03:39:54
Access level:the public Released:2018-07-06 14:59:40
Creative Commons license:CC BY
Reference information

Primary reference:
66206. 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]