Silverado Canyon Pinna-Hemiaster Association (Cretaceous to of the United States)

Also known as Locality 9b

Where: Orange County, California (33.8° N, 117.7° W: paleocoordinates 35.8° N, 82.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Holz Shale Member (Ladd Formation), Turonian to Turonian (93.9 - 83.6 Ma)

• from "about 1 m of strata"

• group of beds-level stratigraphic resolution

Environment/lithology: paralic; lithified siltstone and lithified shale

• "in marginal marine waters, possibly a mudflat environment"

•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: bulk, surface (in situ),

• "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

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 80943: authorized by John Alroy, entered by John Alroy on 21.05.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Echinoidea
 Spatangoida - Hemiasteridae
Hemiaster californicus
Hemiaster californicus Clark 1891 heart urchin
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp.
Dentalium sp. Linnaeus 1758 tusk shell
Bivalvia
 Ostreida - Pinnidae
Pinna sp.
Pinna sp. Linnaeus 1758 oyster
"sp. A"
 Pectinida - Anomiidae
Anomia sp.
Anomia sp. Linnaeus 1758 jingle
Gastropoda
 Sorbeoconcha - Naticidae
"Euspira shumardiana" = Polinices shumardianus
"Euspira shumardiana" = Polinices shumardianus Gabb 1864 moon snail
 Neogastropoda - Paladmetidae
? Paladmete sp.
? Paladmete sp. Gardner 1916 snail
 Neogastropoda - Turridae
Amuletum sp.
Amuletum sp. Stephenson 1941 turrid