San Nicholas Island (SN-4): Quaternary, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Procerithiidae
Bittium ? armillatum Carpenter 1864
recombined as Lirobittium armillatum
Gastropoda - Cerithiopsidae
Seila montereyensis Bartsch 1907
Gastropoda - Triphoridae
Triphora cf. pedroana (Bartsch 1907)
recombined as Monophorus pedroanus
Gastropoda - Littorinidae
Littorina cf. scutulata Gould 1849
recombined as Littorina (Littorina) scutulata
Lacuna unifasciata Carpenter 1857
recombined as Lacuna (Epheria) unifasciata
Littorina cf. planaxis Philippi 1847
replaced by Littorina (Neritrema) keenae
Gastropoda - Hipponicidae
Hipponix antiquatus (Linnaeus 1767)
    = Antisabia panamensis Adams 1852
Hendy 2020
Gastropoda - Neogastropoda - Muricidae
? Maxwellia cf. gemma (Sowerby 1879)
Ocenebra cf. lurida (Middendorff 1848)
recombined as Paciocinebrina lurida
Gastropoda - Neogastropoda - Olividae
Olivella biplicata (Sowerby 1825)
recombined as Callianax biplicata
Gastropoda - Neogastropoda - Conidae
Conus californicus Reeve 1844
recombined as Californiconus californicus
Gastropoda - Neogastropoda - Columbellidae
Amphissa cf. versicolor Dall 1871
Gastropoda - Neogastropoda - Mitridae
Mitra idae Melville 1893
recombined as Mitra (Atrimitra) idae
Gastropoda - Caecidae
Caecum cf. californicum Dall 1885
Fartulum ? occidentale Bartsch 1920
synonym of Fartulum dextroversum
Gastropoda - Barleeiidae
Barleeia cf. subtenuis Carpenter 1864
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepipatella lingulata (Gould 1846)
Gastropoda - Patellida - Lottiidae
Acmaea mitra Eschscholtz 1833
Acmaea scabra (Gould 1846)
original and current combination Patella (Lottia) scabra
Lottia gigantea Sowerby 1834
Gastropoda - Lepetellida - Fissurellidae
Diodora ? aspera (Rathke 1833)
Fissurella volcano Reeve 1849
Gastropoda - Lepetellida - Haliotidae
Haliotis cf. cracherodii Leach 1814
Bivalvia - Carditida - Carditidae
Glans subquadrata (Carpenter 1864)
synonym of Glans carpenteri
Bivalvia - Cardiida - Semelidae
Cumingia californica Conrad 1837
Bivalvia - Lucinida - Lucinidae
Epilucina californica (Conrad 1837)
original and current combination Phacoides californicus
Bivalvia - Mytilida - Mytilidae
Mytilus californianus Conrad 1837
Bivalvia - Pectinida - Pectinidae
Hinnites giganteus (Gray 1825)
recombined as Crassadoma gigantea
Polyplacophora - Neoloricata - Acanthochitonidae
"Cryptochiton" stelleri (Middendorf 1847)
Anthozoa - Scleractinia - Dendrophylliidae
Balanophyllia elegans Verrill 1864
see common names

Geography
Country:United States State/province:California County:Ventura
Coordinates: 33.2° North, 119.6° West (view map)
Paleocoordinates:33.2° North, 119.2° West
Basis of coordinate:stated in text
Altitude:85 feet
Geographic resolution:outcrop
Time
Period:Quaternary
10 m.y. bin:Cenozoic 6
Key time interval:Quaternary
Age range of interval:2.58000 - 0.00000 m.y. ago
Stratigraphy
Formation:Unnamed
Local section:Seal Beach
Regional section:San Nicholas Island
Stratigraphic resolution:bed
Stratigraphy comments: 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.
Lithology and environment
Primary lithology:pebbly,shelly/skeletal conglomeratic,calcareous sandstone
Includes fossils?Y
Lithology description: Generally comprise poorly sorted calcareous sand and gravel composed primarily of mollusc shell fragments, echinoid plates and spines, calcareous algae, and bryozoans.
Environment:coastal indet.
Glacial or sequence phase:transgressive systems tract
Geology comments: 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
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils,some microfossils
Collection methods:selective quarrying,field collection
Reason for describing collection:general faunal/floral analysis
Collection method comments: Collections made by Vedder et al (1955-1956). Earlier collections by Cooper (1894), and Howard (1955)
Taxonomic list comments:Comprehensive for invertebrates
Metadata
Also known as:Vedder & Norris (1963) SN-4
Database number:37946
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-03-27 13:10:43 Last modified:2013-11-25 13:37:23
Access level:the public Released:2004-03-27 13:10:43
Creative Commons license:CC BY
Reference information

Primary reference:
10107. 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]

Secondary references:

63217 A. J. W. Hendy. 2020. Unpublished taxonomic backbone for Eastern Pacific Invertebrate Communities of the Cenozoic (EPICC) Thematic Collections Network. [A. Hendy/A. Hendy/A. Hendy]