San Nicholas Island (SN-8): Quaternary, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea - Camarodonta - Strongylocentrotidae
Strongylocentrotus ? purpuratus (Stimpson 1857)
original and current combination Echinus purpuratus
Gastropoda - Patellida - Lottiidae
Acmaea sp. n. sp. Eschscholtz 1830
Acmaea cf. limatula (Carpenter 1864)
original and current combination Patella limatula
Acmaea ? scabra (Gould 1846)
original and current combination Patella (Lottia) scabra
Gastropoda - Turbinidae
Astraea gibberosa (Dillwyn 1817)
recombined as Pomaulax gibberosa
Gastropoda - Trochidae
Tegula ? funebralis (Adams 1855)
original and current combination Chlorostoma funebrale
Tegula ? brunnea (Philippi 1849)
recombined as Chlorostoma brunnea
Gastropoda - Lepetellida - Haliotidae
Haliotis cf. cracherodii Leach 1814
Gastropoda - Hipponicidae
Hipponix cf. tumens (Carpenter 1864)
Gastropoda - Neogastropoda - Columbellidae
Mitrella cf. carinata (Hinds 1844)
recombined as Alia carinata
Bivalvia - Carditida - Carditidae
Glans subquadrata (Carpenter 1864)
synonym of Glans carpenteri
Bivalvia - Lucinida - Lucinidae
Epilucina californica (Conrad 1837)
original and current combination Phacoides californicus
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:2.58000 - 0.00000 m.y. ago
Stratigraphy
Formation:Unnamed
Local section:Jackson Hill
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-8
Database number:37942
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-03-27 13:05:48 Last modified:2013-11-25 13:37:23
Access level:the public Released:2004-03-27 13:05:48
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]