CAS 681 - Alverson Cañon [Imperial Fm] (Pliocene of the United States)

Where: Imperial County, California (32.8° N, 116.0° W: paleocoordinates 32.6° N, 114.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Early/Lower Pliocene (5.3 - 3.6 Ma)

• 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 the coral reef which crosses the canon toward its source.

• bed-level stratigraphic resolution

Environment/lithology: marine; poorly lithified reef rocks

• SPECIFIC LITHOLOGY: Coral reef. LITHIFICATION: Poorly lithified, on the basis of figured specimens.

Size class: macrofossils

Reposited in the CAS

Collection methods: bulk,

• COLLECTORS: G.D. Hanna. REPOSITORY: CAS.

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 96545: authorized by Austin Hendy, entered by Austin Hendy on 11.06.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for molluscs. NOMENCLATURE: Authoritative publication, with antiquated nomenclature, and species-resolution identifications.
Gastropoda
 Cerithioidea - Turritellidae
Turritella imperialis Hanna 1926 turret shell
 Sorbeoconcha - Tonnidae
Malea ringens Swainson 1822 tun shell
 Heterostropha - Architectonicidae
"Architectonica quadriceps" = Architectonica nobilis
"Architectonica quadriceps" = Architectonica nobilis Röding 1798 sundial
Bivalvia
 Pectinida - Pectinoidae
"Pecten mendenhalli" = Argopecten mendenhalli, "Pecten keepi" = Euvola keepi, "Pecten mediacostatus n. sp." = Chlamys mediacostata, Chlamys cf. corteziana
"Pecten mendenhalli" = Argopecten mendenhalli Arnold 1906 calico scallop
"Pecten keepi" = Euvola keepi Arnold 1906 scallop
"Pecten mediacostatus n. sp." = Chlamys mediacostata Hanna 1926 scallop
Chlamys cf. corteziana Durham 1950 scallop
 Ostreida - Ostreidae
"Ostrea vespertina" = Dendostrea vespertina
"Ostrea vespertina" = Dendostrea vespertina Conrad 1855 oyster
 Lucinida - Lucinidae
"Phacoides xantusi" = Miltha xantusi, "Lucina edentuloides" = Pegophysema edentuloides
"Phacoides xantusi" = Miltha xantusi Dall 1903 clam
"Lucina edentuloides" = Pegophysema edentuloides Verrill 1901 clam
 Thraciida - Thraciidae
Cyathodonta undulata Conrad 1849 clam
 Cardiida - Chamidae
Chama frondosa Broderip 1835 jewel box