San Nicholas Island (SN-10) (Quaternary of the United States)

Also known as Vedder & Norris (1963) SN-10

Where: Ventura County, California (33.2° N, 119.5° W: paleocoordinates 33.2° N, 119.2° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Unnamed Formation, Quaternary (2.6 - 0.0 Ma)

• Dune sand and fossiliferous marine terrace deposits of Quaternary age. These overlie Eocene strata. Fossils come from seven well-developed wave-cut platforms at altitudes of 25 to 990 feet. Several submerged terraces are present on the shelf adjacent to the island., the lowest being 400 ft below sea-level. Presumably all the terrace platforms on San Nicholas Island were cut later than the middle Pleistocene diastrophism recognized elsewhere in southern California. Terrace platforms are covered with a variety of sediments of marine and non-marine origin and range in thickness from a few inches to many feet.

• bed-level stratigraphic resolution

Environment/lithology: coastal; pebbly, shelly/skeletal, conglomeratic, calcareous sandstone

• Higher emergent terraces may represent wave-abraded platforms that were eroded during eustatic changes in sea level combined with tectonic uplift. The lowest emergent terrace may have been cut during eustatic sea-level changes followed by very slight regional seaward warping. Presumably all the terrace platforms on San Nicholas Island were cut later than the middle Pleistocene diastrophism recognized elsewhere in southern California
• Generally comprise poorly sorted calcareous sand and gravel composed primarily of mollusc shell fragments, echinoid plates and spines, calcareous algae, and bryozoans.

Size class: macrofossils

Collection methods: quarrying,

• Collections made by Vedder et al (1955-1956). Earlier collections by Cooper (1894), and Howard (1955)

Primary reference: J. G. Vedder and R. M. Norris. 1963. Geology of San Nicolas Island, California. United States Geological Survey Professional Paper 369:1-65 [A. Miller/A. Hendy/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 37940: authorized by Austin Hendy, entered by Austin Hendy on 27.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Comprehensive for invertebrates
unclassified
  -
Polychaeta
  -
Bivalvia
 Arcida - Arcidae
"Arca ? sisquocensis" = Arca (Arca) sisquocensis
"Arca ? sisquocensis" = Arca (Arca) sisquocensis Reinhart 1937 ark
 Arcida - Glycymerididae
"Glycymeris subobsoleta" = Glycymeris (Axinola) septentrionalis
"Glycymeris subobsoleta" = Glycymeris (Axinola) septentrionalis Middendorf 1849 clam
 Pectinida - Pectinoidae
"Chlamys ? hastatus" = Chlamys (Chlamys) hastata
"Chlamys ? hastatus" = Chlamys (Chlamys) hastata Sowerby 1842 scallop
 Mytilida - Mytilidae
Mytilus californianus Conrad 1837 mussel
 Carditida - Carditidae
"Glans subquadrata" = Glans carpenteri Lamy 1922 clam
Miodontiscus prolongatus Carpenter 1864 clam
 Cardiida - Veneridae
"Protothaca cf. staminea" = Leukoma staminea, "Ventricolaria ? fordii" = Globivenus fordii, Saxidomus nuttalli, "Transennella tantilla" = Nutricola tantilla, "Petricola cf. carditoides" = Petricola (Petricola) carditoides
"Protothaca cf. staminea" = Leukoma staminea Conrad 1837 venus clam
"Ventricolaria ? fordii" = Globivenus fordii Yates 1890 venus clam
Saxidomus nuttalli Conrad 1837 venus clam
"Transennella tantilla" = Nutricola tantilla Gould 1853 venus clam
"Petricola cf. carditoides" = Petricola (Petricola) carditoides Conrad 1837 venus clam
 Cardiida -
Turtonia cf. minuta Fabricius 1780 clam
 Cardiida - Tellinidae
"Tellina salmonea" = Tellina (Cadella) nuculoides
"Tellina salmonea" = Tellina (Cadella) nuculoides Reeve 1854 tellin clam
 Cardiida - Semelidae
Cumingia californica Conrad 1837 clam
 Cardiida - Cardiidae
"Clinocardium nuttallii" = Clinocardium (Clinocardium) nuttallii
"Clinocardium nuttallii" = Clinocardium (Clinocardium) nuttallii Conrad 1837 cockle
 Cardiida - Neoleptonidae
Bernardina bakeri Dall 1910 clam
 Cardiida - Lasaeidae
"Lasaea cf. cistula" = Lasaea adansoni
"Lasaea cf. cistula" = Lasaea adansoni Gmelin 1791 clam
 Hiatellida - Hiatellidae
"Hiatella arctica" = Hiatella (Hiatella) arctica
"Hiatella arctica" = Hiatella (Hiatella) arctica Linnaeus 1767 clam
 Lucinida - Lucinidae
Epilucina californica Conrad 1837 clam
Gastropoda
 Ptenoglossa - Epitoniidae
Opalia wroblewskyi wentletrap
Subspecies: Opalia wroblewskyi chacei
 Patellogastropoda - Lottiidae
Acmaea scutum Eschscholtz 1833 limpet
Acmaea mitra Eschscholtz 1833 limpet
Acmaea pelta Eschscholtz 1833 limpet
 Triphoroidea - Cerithiopsidae
Cerithiopsis sp. Hanley 1849 snail
 Neogastropoda - Olividae
"Olivella cf. pedroana" = Olivella (Callianax) pedroana
"Olivella cf. pedroana" = Olivella (Callianax) pedroana Conrad 1856 olive snail
 Neogastropoda - Columbellidae
Mitrella tuberosa Carpenter 1864 snail
 Neogastropoda - Buccinidae
Calicantharus fortis Carpenter 1866 true whelk
 Neogastropoda - Fasciolariidae
Barbarofusus arnoldi Cossmann 1903 snail
 Neogastropoda - Cystiscidae
 Neogastropoda - Muricidae
Acanthina spirata unicorn
Subspecies: Acanthina spirata punctulata
Ocenebra lurida murex snail
Subspecies: Ocenebra lurida munda
Ocenebra interfossa murex snail
 Neogastropoda - Mangeliidae
"Mangelia interfossa" = Cythara (Mangelia), "Mangelia aff. rhyssa" = Cythara (Mangelia), Mangelia variegata
"Mangelia interfossa" = Cythara (Mangelia) snail
"Mangelia aff. rhyssa" = Cythara (Mangelia) snail
Mangelia variegata Carpenter 1864 snail
 Neogastropoda - Mitromorphidae
 Neogastropoda -
Glyphostoma sp. n. sp. Gabb 1872 snail
 Neogastropoda - Pseudomelatomidae
 Littorinoidea - Littorinidae
Lacuna cf. carinata Gould 1848 periwinkle
Littorina scutulata Gould 1849 periwinkle
 Vanikoroidea - Hipponicidae
Hipponix antiquatus Linnaeus 1767 hoof shell
 Vanikoroidea - Eulimidae
 Vermetoidea - Vermetidae
 Calyptraeoidea - Calyptraeidae
Crepidula perforans slipper shell
Crepidula adunca Sowerby 1824 slipper shell
Crepidula onyx Sowerby 1824 slipper shell
"Crepidula aculeata" = Bostrycapulus aculeatus Gmelin 1791 slipper shell
 Rissooidea - Barleeidae
 Rissooidea - Rissoidae
 Sorbeoconcha - Cerithiidae
Bittium eschrichtii cerith snail
Subspecies: Bittium eschrichtii montereyense
 Pyramidelloidea - Pyramidellidae
 Haliotoidea - Haliotidae
 Turbinoidea - Turbinidae
 Turbinoidea - Phasianellidae
 Fissurelloidea - Fissurellidae
Fissurella volcano Reeve 1849 snail
Diodora aspera Rathke 1833 snail
 Trochoidea - Trochidae
"Pupillaria pupilla" = Margarites (Pupillaria) top snail
Pupillaria cf. optabilis Carpenter 1864 top snail
Calliostoma ? ligatum Gould 1849 top snail
Scaphopoda
 Dentaliida - Dentaliidae
"Dentalium semipolitum" = Dentalium semistriatum semipolitum
"Dentalium semipolitum" = Dentalium semistriatum semipolitum Broderip and Sowerby 1829 tusk shell
Polyplacophora
 Neoloricata - Mopaliidae
 Neoloricata - Ischnochitonidae
"Stenoplax cf. conspicuus" = Stenoplax conspicua
"Stenoplax cf. conspicuus" = Stenoplax conspicua Pilsbry 1892 conspicuous chiton
Echinoidea
 Camarodonta - Strongylocentrotidae
Anthozoa
 Scleractinia - Dendrophylliidae
Balanophyllia elegans Verrill 1864 stony coral