USGS 3923 - Alverso Cañon [Imperial Fm]: Early/Lower Pliocene, California
collected by Bowers & Mendenhall 1904

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea - Clypeasteroida - Clypeasteridae
Clypeaster bowersi Weaver 1908
2 specimens
Bivalvia - Ostreida - Ostreidae
Ostrea vespertina Conrad 1855
4 specimens
recombined as Dendostrea vespertina
Bivalvia - Pectinida - Pectinidae
Pecten mendenhalli Arnold 1906
13 specimens
recombined as Argopecten mendenhalli
Pecten keepi Arnold 1906
2 specimens
recombined as Euvola keepi
Bivalvia - Pectinida - Spondylidae
Spondylus calcifer Carpenter 1857
2 specimens
Bivalvia - Carditida - Crassatellidae
Crassatellites subgibbosus Hanna 1926
2 specimens
recombined as Hybolophus subgibbosa
Bivalvia - Lucinida - Lucinidae
Phacoides xantusi Dall 1903
3 specimens
recombined as Miltha xantusi
Bivalvia - Cardiida - Veneridae
Dosinia dunkeri (Philippi 1844)
1 specimen
Bivalvia - Cardiida - Chamidae
Echinochama californica Dall 1903
2 specimens
recombined as Arcinella californica
Bivalvia - Hiatellida - Hiatellidae
Panope generosa (Gould 1850)
1 specimen
original and current combination Panopea generosa
Bivalvia - Thraciida - Thraciidae
Cyathodonta undulata Conrad 1849
1 specimen
Gastropoda - Opisthobranchia - Bullidae
Bullaria striata (Bruguiére 1792)
2 specimens
original and current combination Bulla striata
Gastropoda - Neogastropoda - Fasciolariidae
Fasciolaria princeps Sowerby 1825
1 specimen
recombined as Triplofusus princeps
Gastropoda - Strombidae
Strombus galeatus Swainson 1823
2 specimens
Gastropoda - Tonnidae
Malea ringens (Swainson 1822)
3 specimens
see common names

Geography
Country:United States State/province:California County:Imperial
Coordinates: 32.8° North, 116.0° West (view map)
Paleocoordinates:32.6° North, 114.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Pliocene
Stage:Zanclean 10 m.y. bin:Cenozoic 6
Key time interval:Early/Lower Pliocene
Age range of interval:5.33300 - 3.60000 m.y. ago
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Imperial Formation, for which lithostratigraphic relationships are not discussed. AGE: Early Pliocene, based on existing (more recent) collections. STRATIGRAPHIC POSITION: From unknown position within formation.
Lithology and environment
Primary lithology: poorly lithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Fossil collections generally originate from sandstone layers. LITHIFICATION: Poorly lithified, on the basis of figured specimens.
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:bulk,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:USGS
Collectors:Bowers & Mendenhall Collection dates:1904
Collection method comments: COLLECTORS: S. Bowers and W.C. Mendenhall, 1904. REPOSITORY: USGS.
Taxonomic list comments:COVERAGE: Exhaustive for molluscs. NOMENCLATURE: Authoritative publication, with antiquated nomenclature, and species-resolution identifications.
Metadata
Database number:96542
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2010-06-11 19:30:59 Last modified:2013-11-25 13:37:23
Access level:the public Released:2010-06-11 19:30:59
Creative Commons license:CC BY
Reference information

Primary reference:
32774. G. D. Hanna. 1926. Paleontology of Coyote Mountain, Imperial County, California. Proceedings of the California Academy of Sciences 14(18):427-503 [A. Hendy/A. Hendy]