San Nicholas Island (SN-3) (Quaternary of the United States)

Also known as Vedder & Norris (1963) SN-3

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 37947: authorized by Austin Hendy, entered by Austin Hendy on 27.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Comprehensive for invertebrates
 Sessilia - Balanidae
Balanus sp. Da Costa 1778 barnacle
 Sessilia - Tetraclitidae
Tetraclita squamosa barnacle
SUBSPECIES: Tetraclita squamosa rubescens
 Spiomorpha -
 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, "Hinnites giganteus" = Crassadoma gigantea
"Chlamys hastatus" = Chlamys (Chlamys) hastata Sowerby 1842 scallop
"Hinnites giganteus" = Crassadoma gigantea Gray 1825 scallop
 Mytilida - Mytilidae
Mytilus californianus Conrad 1837 mussel
"Modiolus fornicatus" = Modiolus (Modiolus) carpenteri Soot-Ryen 1963 mussel
 Carditida - Carditidae
"Glans subquadrata" = Glans carpenteri, Milneria minima
"Glans subquadrata" = Glans carpenteri Lamy 1922 clam
Milneria minima Dall 1871 clam
 Pholadida - Pholadidae
Penitella penita Conrad 1837 clam
Parapholas cf. californica Conrad 1837 clam
 Cardiida - Chamidae
Chama arcana Bernard 1976 jewel box
 Cardiida - Mactridae
"Schizothaerus nuttalli" = Tresus nuttallii
"Schizothaerus nuttalli" = Tresus nuttallii Conrad 1837 clam
 Cardiida - Ungulinidae
Diplodonta orbella Gould 1851 clam
 Cardiida - Veneridae
"Protothaca staminea" = Leukoma staminea, Humilaria perlaminosa, "Ventricolaria fordii" = Globivenus fordii, "Irus lamellifer" = Irusella lamellifera, Saxidomus nuttalli, "Transennella tantilla" = Nutricola tantilla, "Petricola carditoides" = Petricola (Petricola) carditoides
"Protothaca staminea" = Leukoma staminea Conrad 1837 venus clam
Humilaria perlaminosa Conrad 1855 venus clam
"Ventricolaria fordii" = Globivenus fordii Yates 1890 venus clam
"Irus lamellifer" = Irusella lamellifera Conrad 1837 venus clam
Saxidomus nuttalli Conrad 1837 venus clam
"Transennella tantilla" = Nutricola tantilla Gould 1853 venus clam
"Petricola carditoides" = Petricola (Petricola) carditoides Conrad 1837 venus clam
 Cardiida - Psammobiidae
 Cardiida - Semelidae
Cumingia californica Conrad 1837 clam
 Cardiida - Cardiidae
"Clinocardium nuttallii" = Clinocardium (Clinocardium) nuttallii
"Clinocardium nuttallii" = Clinocardium (Clinocardium) nuttallii Conrad 1837 cockle
 Cardiida - Lasaeidae
"Lasaea cf. cistula" = Lasaea adansoni
"Lasaea cf. cistula" = Lasaea adansoni Gmelin 1791 clam
 Hiatellida - Hiatellidae
"Hiatella cf. arctica" = Hiatella (Hiatella) arctica, "Panope cf. generosa" = Panopea abrupta
"Hiatella cf. arctica" = Hiatella (Hiatella) arctica Linnaeus 1767 clam
"Panope cf. generosa" = Panopea abrupta Conrad 1849 clam
 Lucinida - Lucinidae
Epilucina californica Conrad 1837 clam
 Patellogastropoda - Lottiidae
Acmaea sp. n. sp. Eschscholtz 1830 limpet
Acmaea digitalis Eschscholtz 1833 limpet
Acmaea scutum Eschscholtz 1833 limpet
Acmaea funiculata Carpenter 1864 limpet
Acmaea mitra Eschscholtz 1833 limpet
Acmaea pelta Eschscholtz 1833 limpet
 Triphoroidea - Triphoridae
 Triphoroidea - Cerithiopsidae
 Neogastropoda - Olividae
"Olivella biplicata" = Olivella (Callianax) biplicata
"Olivella biplicata" = Olivella (Callianax) biplicata Sowerby 1825 olive snail
 Neogastropoda - Columbellidae
Mitrella tuberosa Carpenter 1864 snail
Amphissa versicolor Dall 1871 snail
 Neogastropoda - Buccinidae
Calicantharus fortis Carpenter 1866 true whelk
"Searlesia" dira true whelk
 Neogastropoda - Fasciolariidae
 Neogastropoda - Cystiscidae
 Neogastropoda - Mitridae
"Mitra idae" = Mitra (Atrimitra) idae
"Mitra idae" = Mitra (Atrimitra) idae Melville 1893 mitre shell
 Neogastropoda - Muricidae
Ocenebra cf. lurida murex snail
Ocenebra foveolata murex snail
Ocenebra cf. interfossa murex snail
Subspecies: Ocenebra interfossa clathrata
 Neogastropoda - Mangeliidae
"Mangelia interfossa" = Cythara (Mangelia), "Mangelia cf. nitens" = Cythara (Mangelia), "Mangelia aff. rhyssa" = Cythara (Mangelia), Mangelia variegata
"Mangelia interfossa" = Cythara (Mangelia) snail
"Mangelia cf. nitens" = Cythara (Mangelia) snail
"Mangelia aff. rhyssa" = Cythara (Mangelia) snail
Mangelia variegata Carpenter 1864 snail
 Neogastropoda - Mitromorphidae
 Neogastropoda - Conidae
"Conus californicus" = Californiconus californicus
"Conus californicus" = Californiconus californicus Reeve 1844 cone shell
 Neogastropoda - Pseudomelatomidae
 Littorinoidea - Littorinidae
Lacuna cf. carinata Gould 1848 periwinkle
Littorina planaxis Philippi 1847 periwinkle
Littorina scutulata Gould 1849 periwinkle
 Vanikoroidea - Hipponicidae
Hipponix tumens hoof shell
Hipponix antiquatus Linnaeus 1767 hoof shell
 Vanikoroidea - Eulimidae
 Velutinoidea - Velutinidae
"Lamellaria rhombica" = Marsenina rhombica, "Velutina aff. laevigata" = Velutina velutina
"Lamellaria rhombica" = Marsenina rhombica Dall 1871 snail
"Velutina aff. laevigata" = Velutina velutina Müller 1776 snail
 Naticoidea - Naticidae
Lunatia cf. lewisii, "Cryptonatica cf. clausa" = Cryptonatica affinis
Lunatia cf. lewisii Gould 1847 moon snail
"Cryptonatica cf. clausa" = Cryptonatica affinis Gmelin 1791 moon snail
 Vermetoidea - Vermetidae
Aletes squamigerus Carpenter 1857 worm shell
 Calyptraeoidea - Calyptraeidae
Crepipatella lingulata Gould 1846 slipper shell
Crepidula perforans slipper shell
Crepidula adunca Sowerby 1824 slipper shell
Crepidula cf. excavata Broderip 1834 slipper shell
Crepidula onyx Sowerby 1824 slipper shell
Crepidula princeps Conrad 1855 slipper shell
 Rissooidea - Barleeidae
 Rissooidea - Rissoidae
 Truncatelloidea - Assimineidae
 Truncatelloidea - Caecidae
 Sorbeoconcha - Cerithiidae
Bittium eschrichtii cerith snail
Subspecies: Bittium eschrichtii montereyense
Bittium armillatum cerith snail
 Sorbeoconcha - Dialidae
"Diala" cf. marmorea Carpenter 1864 snail
 Pulmonata - Trimusculidae
 Basommatophora - Siphonariidae
 Pyramidelloidea - Pyramidellidae
 Haliotoidea - Haliotidae
 Turbinoidea - Turbinidae
 Turbinoidea - Phasianellidae
 Fissurelloidea - Fissurellidae
Diodora aspera Rathke 1833 snail
Puncturella cf. cooperi Carpenter 1864 puncturella
 Trochoidea - Trochidae
"Pupillaria cf. succincta" = Margarites (Pupillaria) top snail
"Pupillaria cf. oldroydi" = Margarites (Pupillaria) top snail
Pupillaria cf. optabilis Carpenter 1864 top snail
Calliostoma cf. ligatum Gould 1849 top snail
 Trochoidea - Tegulidae
 Trochoidea - Liotiidae
 Neoloricata - Mopaliidae
 Neoloricata - Ischnochitonidae
Stenoplax sp. Carpenter 1879 chiton
Tonicella cf. lineata Wood 1815 lined red chiton
 Camarodonta - Strongylocentrotidae
 Terebratulida - Terebrataliidae