San Nicholas Island (SN-12) (Quaternary of the United States)

Also known as Vedder & Norris (1963) SN-12

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 37938: 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 ? tintinnabulum" = Megabalanus tintinnabulum
"Balanus ? tintinnabulum" = Megabalanus tintinnabulum Linnaeus 1758 barnacle
Subspecies: Balanus cf. tintinnabulum californicus
 Arcida - Arcidae
Anadara ? multicostata Sowerby 1833 ark
 Arcida - Glycymerididae
"Glycymeris subobsoleta" = Glycymeris (Axinola) septentrionalis
"Glycymeris subobsoleta" = Glycymeris (Axinola) septentrionalis Middendorf 1849 clam
 Pectinida - Pectinoidae
"Pecten vogdesi" = Euvola vogdesi, "Aequipecten cf. circularis" = Argopecten ventricosus, "Hinnites giganteus" = Crassadoma gigantea
"Pecten vogdesi" = Euvola vogdesi Arnold 1906 scallop
"Aequipecten cf. circularis" = Argopecten ventricosus Sowerby 1842 calico scallop
Aequipecten circularis aequisulcatus
"Hinnites giganteus" = Crassadoma gigantea Gray 1825 scallop
 Ostreida - Ostreidae
Ostrea cf. lurida Carpenter 1864 oyster
 Mytilida - Mytilidae
Mytilus californianus Conrad 1837 mussel
Septifer bifurcatus Conrad 1837 mussel
 Carditida - Carditidae
"Glans subquadrata" = Glans carpenteri
"Glans subquadrata" = Glans carpenteri Lamy 1922 clam
 Pholadida - Pholadidae
Penitella penita Conrad 1837 clam
Parapholas californica Conrad 1837 clam
 Cardiida - Chamidae
Chama arcana Bernard 1976 jewel box
 Cardiida - Mactridae
"Spisula planulata" = Simomactra planulata, "Schizothaerus nuttalli" = Tresus nuttallii
"Spisula planulata" = Simomactra planulata Conrad 1837 clam
"Schizothaerus nuttalli" = Tresus nuttallii Conrad 1837 clam
 Cardiida - Veneridae
"Irus lamellifer" = Irusella lamellifera, Saxidomus nuttalli, "Transennella tantilla" = Nutricola tantilla
"Irus lamellifer" = Irusella lamellifera Conrad 1837 venus clam
Saxidomus nuttalli Conrad 1837 venus clam
"Transennella tantilla" = Nutricola tantilla Gould 1853 venus clam
 Cardiida - Semelidae
Cumingia californica Conrad 1837 clam
 Cardiida - Cardiidae
"Trachycardium quadragenarium" = Trachycardium (Dallocardia) quadragenarium, "Trigoniocardia biangulata" = Ctenocardia biangulata
"Trachycardium quadragenarium" = Trachycardium (Dallocardia) quadragenarium Conrad 1837 cockle
"Trigoniocardia biangulata" = Ctenocardia biangulata Broderip and Sowerby 1829 cockle
 Hiatellida - Hiatellidae
"Panope generosa" = Panopea abrupta
"Panope generosa" = Panopea abrupta Conrad 1849 clam
 Lucinida - Lucinidae
Epilucina californica Conrad 1837 clam
 Patellogastropoda - Lottiidae
Lottia gigantea Sowerby 1834 limpet
Acmaea mitra Eschscholtz 1833 limpet
 Triphoroidea - Triphoridae
 Neogastropoda - Olividae
"Olivella biplicata" = Olivella (Callianax) biplicata
"Olivella biplicata" = Olivella (Callianax) biplicata Sowerby 1825 olive snail
 Neogastropoda - Columbellidae
Mitrella ? tuberosa Carpenter 1864 snail
Amphissa cf. versicolor Dall 1871 snail
 Neogastropoda - Buccinidae
Kelletia ? kelletii Forbes 1850 true whelk
 Neogastropoda - Nassariidae
 Neogastropoda - Fasciolariidae
Barbarofusus ? arnoldi Cossmann 1903 snail
 Neogastropoda -
 Neogastropoda - Mitridae
"Mitra idae" = Mitra (Atrimitra) idae
"Mitra idae" = Mitra (Atrimitra) idae Melville 1893 mitre shell
 Neogastropoda - Muricidae
Jaton cf. festivus murex snail
Ocenebra beta murex snail
 Neogastropoda - Conidae
"Conus californicus" = Californiconus californicus
"Conus californicus" = Californiconus californicus Reeve 1844 cone shell
 Neogastropoda - Pseudomelatomidae
 Neogastropoda - Terebridae
 Littorinoidea - Littorinidae
Littorina ? scutulata Gould 1849 periwinkle
 Vanikoroidea - Hipponicidae
Hipponix tumens hoof shell
Hipponix antiquatus Linnaeus 1767 hoof shell
 Velutinoidea - Triviidae
"Pusula californiana" = Pseudopusula californiana
"Pusula californiana" = Pseudopusula californiana Gray 1827 snail
 Naticoidea - Naticidae
Lunatia cf. lewisii Gould 1847 moon snail
 Cypraeoidea - Cypraeidae
"Zonaria cf. spadicea" = Zonaria (Neobernaya) spadicea
"Zonaria cf. spadicea" = Zonaria (Neobernaya) spadicea Swainson 1823 cowry
 Calyptraeoidea - Calyptraeidae
Crepidula adunca Sowerby 1824 slipper shell
 Tonnoidea - Bursidae
"Bursa californica" = Crossata ventricosa
"Bursa californica" = Crossata ventricosa Broderip 1833 frog shell
 Rissooidea - Barleeidae
 Rissooidea - Rissoidae
 Rissooidea - Vitrinellidae
 Truncatelloidea - Caecidae
 Truncatelloidea - Tornidae
 Sorbeoconcha - Turritellidae
Turritella cooperi Carpenter 1864 turret shell
 Pulmonata - Trimusculidae
 Pyramidelloidea - Pyramidellidae
 Haliotoidea - Haliotidae
 Turbinoidea - Turbinidae
"Astraea cf. undosa" = Astraea (Pomaulax) undosa Wood 1828 snail
Astraea cf. gibberosa Dillwyn 1817 red turban
 Turbinoidea - Phasianellidae
 Fissurelloidea - Fissurellidae
Fissurella volcano Reeve 1849 snail
Megathura crenulata Sowerby 1825 snail
 Trochoidea - Trochidae
Pupillaria ? optabilis Carpenter 1864 top snail
 Trochoidea - Tegulidae
 Camarodonta - Strongylocentrotidae
 Clypeasteroida - Dendrasteridae