Silverado Canyon Offshore Inoperna-Pterotrigonia Association (Cretaceous of the United States)

Also known as Locality 4

Where: Orange County, California (33.8° N, 117.7° W: paleocoordinates 34.7° N, 81.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Holz Shale Member (Ladd Formation), Turonian (93.9 - 89.8 Ma)

• from "about 1 m of strata"

• group of beds-level stratigraphic resolution

Environment/lithology: prodelta; lithified siltstone and lithified shale

• "in normal marine waters at a depth below wave base"

•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 80929: authorized by John Alroy, entered by John Alroy on 21.05.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Gastropoda
 Sorbeoconcha - Aporrhaidae
"Alaria nodosa" = Latiala nodosa
"Alaria nodosa" = Latiala nodosa Packard 1922 snail
Bivalvia
 Ostreida - Ostreidae
Ostrea crescentica Packard 1922 oyster
 Mytilida - Mytilidae
Inoperna bellarugosa Popenoe 1937 mussel
 Trigoniida - Megatrigonioidae
Pterotrigonia klamathonia Anderson 1958 clam
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831