Silverado Canyon Inoceramus-Acila Paleocommunity (Cretaceous of the United States)

Also known as Locality 8

Where: Orange County, California (33.8° N, 117.7° W)

• Paleocoordinates: 42.6° N, 79.7° W (Wright 2013)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Holz Shale Member (Ladd Formation), Campanian (83.6 - 72.2 Ma)

• from "about 1 m of strata"

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal; lithified siltstone and lithified shale

• "in restricted marine water at shallow depths... perhaps the result of a lagoonal setting"

•the Holz Shale in general is "in a shallow marine setting, including prodelta, lagoonal and bay environments"

• "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

Size class: macrofossils

Collection methods: surface (in situ),

• "selective collecting, by breaking the strata at the site"

•collections apparently are at the California State University at Fullerton

Primary reference: 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]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 80945: authorized by John Alroy, entered by John Alroy on 21.05.2008

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Cardiida - Tellinidae
Tellina alisoensis
Tellina alisoensis Packard 1922 tellin clam
 Cardiida - Mactridae
Cymbophora sp.
Cymbophora sp. Gabb 1869 clam
"sp. A"
 Carditida - Crassatellidae
Crassatella conradiana
Crassatella conradiana Gabb 1864 clam
 Carditida - Astartidae
Eriphyla sp.
Eriphyla sp. Gabb 1864 clam
 Pectinida - Propeamussiidae
Propeamussium sp.
Propeamussium sp. de Gregorio 1884 mud scallop
 Myalinida - Inoceramidae
Inoceramus spp.
Inoceramus spp. Sowerby 1814 clam
 Nuculida - Nuculidae
Nucula sp., "Acila demessa" = Acila (Truncacila) demessa
Nucula sp. Lamarck 1799 nut clam
"Acila demessa" = Acila (Truncacila) demessa Finlay 1927 divaricate nutclam
Echinoidea
 Spatangoida - Hemiasteridae
? Hemiaster sp.
? Hemiaster sp. Agassiz and Desor 1847 heart urchin