Silverado Canyon Glycymeris-Astarte Association: Turonian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea - Spatangoida - Hemiasteridae
Hemiaster californicus Clark 1891
Gastropoda - Neogastropoda - Melongenidae
Siphonalia dubius Packard 1922
recombined as Saturnus dubius
Gastropoda - Solariellidae
Margaritella crenulata Gabb 1864
recombined as Solariella crenulata
Scaphopoda
Dentalium whiteavesi Anderson and Hanna 1935
Bivalvia - Mytilida - Mytilidae
Modiolus siskiyouensis (Gabb 1864)
recombined as Volsella siskiyouensis
Inoperna bellarugosa Popenoe 1937
Bivalvia - Arcida - Glycymerididae
Glycymeris pacificus (Anderson 1902)
recombined as Glycymeris pacifica
Bivalvia - Pectinida - Entoliidae
Syncyclonema operculiformis (Gabb 1864)
Bivalvia - Carditida - Astartidae
Astarte sulcata Packard 1922
recombined as Alleinacin sulcata
Cephalopoda - Ammonitida - Collignoniceratidae
Subprionocyclus sp.
see common names

Geography
Country:United States State/province:California County:Orange
Coordinates: 33.8° North, 117.7° West (view map)
Paleocoordinates:34.7° North, 81.4° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Turonian 10 m.y. bin:Cretaceous 6
Key time interval:Turonian
Age range of interval:93.90000 - 89.80000 m.y. ago
Stratigraphy
Formation:Ladd Member:Holz Shale
Stratigraphic resolution:group of beds
Stratigraphy comments: from "about 1 m of strata"
Lithology and environment
Primary lithology: lithified siltstone
Secondary lithology: lithified "shale"
Lithology description: "Brown to gray siltstone and shale with interbedded lenses of stringers of limestone, conglomerate, and sandstone" apparently well lithified because strata were "broken" and "disarticulated" during collection
Environment:delta front
Geology comments: "normal marine waters at shallow depths"

the Holz Shale in general is "in a shallow marine setting, including prodelta, lagoonal and bay environments"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:bulk,surface (in situ),field collection
Reason for describing collection:paleoecologic analysis
Collection method comments: "Bulk samples were collected... and brought back to the lab for disarticulation" but there was also "selective collecting, by breaking the strata at the site"
collections apparently are at the California State University at Fullerton
Metadata
Also known as:Locality 11a
Database number:80931
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:marine invertebrate
Created:2008-05-21 21:19:50 Last modified:2008-05-22 13:53:39
Access level:the public Released:2008-05-21 21:19:50
Creative Commons license:CC BY
Reference information

Primary reference:
27237. F. A. Sundberg. 1980. Late Cretaceous paleoecology of the Holz Shale, Orange County, California. Journal of Paleontology 54(4):840-857 [J. Alroy/J. Alroy]