San Nicholas Island (SN-9): Quaternary, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea - Camarodonta - Strongylocentrotidae
Strongylocentrotus cf. franciscanus (Agassiz 1863)
Thecostraca - Balanomorpha - Tetraclitidae
Tetraclita squamosa Bruguière 1789
Subspecies: Tetraclita squamosa rubescens
Gastropoda - Procerithiidae
Bittium ? armillatum Carpenter 1864
Gastropoda - Littorinidae
Lacuna ? unifasciata Carpenter 1857
Gastropoda - Barleeiidae
Barleeia cf. oldroydi Bartsch 1920
Gastropoda - Rissoidae
Alvania cf. purpurea Dall 1871
Gastropoda - Hipponicidae
Hipponix antiquatus (Linnaeus 1767)
    = Antisabia panamensis Adams 1852
Hendy 2020
Gastropoda - Vermetidae
Spiroglyphus cf. lituellus (Morch 1861)
Gastropoda - Neogastropoda - Pseudomelatomidae
Pseudomelatoma ? torosa (Gabb 1864)
Gastropoda - Neogastropoda - Columbellidae
Mitrella carinata (Hinds 1844)
Amphissa cf. versicolor Dall 1871
Gastropoda - Neogastropoda - Siphonaliidae
Calicantharus cf. fortis (Carpenter 1866)
Gastropoda - Neogastropoda - Buccinidae
"Searlesia" cf. dira Reeve 1846
Gastropoda - Neogastropoda - Olividae
Olivella biplicata (Sowerby 1825)
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepidula californicum
Crepidula ? adunca Sowerby 1824
Gastropoda - Eulimidae
Balcis cf. prefalcata Bartsch 1917
Gastropoda - Cerithiidae
Bittium eschrichtii (Middendorff 1849)
Subspecies: Bittium eschrichtii montereyense
Gastropoda - Heterostropha - Pyramidellidae
Odostomia cf. oldroydi
Gastropoda - Trochidae
Tegula cf. funebralis (Adams 1855)
Tegula cf. brunnea (Philippi 1849)
Gastropoda - Turbinidae
Homalopoma carpenteri (Pilsbry 1889)
Astraea gibberosa (Dillwyn 1817)
Gastropoda - Patellida - Lottiidae
Acmaea ? pelta Eschscholtz 1833
Acmaea cf. scabra (Gould 1846)
Acmaea mitra Eschscholtz 1833
Bivalvia - Mytilida - Mytilidae
Mytilus cf. californianus Conrad 1837
Bivalvia - Lucinida - Lucinidae
Epilucina californica (Conrad 1837)
Parvilucina tenuisculpta (Carpenter 1864)
Bivalvia - Hiatellida - Hiatellidae
Hiatella ? arctica (Linnaeus 1767)
Bivalvia - Cardiida - Semelidae
Cumingia ? californica Conrad 1837
Bivalvia - Cardiida - Chamidae
Chama pellucida Broderip 1835
    = Chama arcana Bernard 1976
Coan et al. 2000
Bivalvia - Cardiida - Veneridae
Transennella tantilla (Gould 1853)
see common names

Geography
Country:United States State/province:California County:Ventura
Coordinates: 33.2° North, 119.5° West (view map)
Paleocoordinates:33.2° North, 119.2° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Quaternary
10 m.y. bin: Cenozoic 6
Key time interval: Quaternary
Age range of interval: 2.58 - 0 m.y. ago
Stratigraphy
Formation:Unnamed
Local section:Hill 905
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-9
Database number:37941
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-03-27 13:02:32 Last modified:2013-11-25 13:37:23
Access level:the public Released:2004-03-27 13:02:32
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:

18663 E. V. Coan, P. V. Scott, and F. R. Bernard. 2000. Bivalve seashells of western North America. Santa Barbara Museum of Natural history Monographs 2:1-764 [A. Miller/A. Hendy/M. Uhen]
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]