GH77-2-754 - Early Pleistocene, Yamaguchi Prefecture (Pleistocene of Japan)

Also known as D.218

Where: Yamaguchi, Japan (35.1° N, 131.2° E: paleocoordinates 35.2° N, 131.0° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Calabrian (1.8 - 0.8 Ma)

• AGE: Planktonic foraminifers and nannoplankton show that the age of the Mollusca is Early Pleistocene, estimated at about 1.5 Ma.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, calcareous siliciclastic sediments

• BATHYMETRY: Upper sublittoral zone. THERMAL TOLERANCES: Cool water fauna. The cool to cold Omma-Manganji molluscan fauna are prevalent, however the warm-water fauna is represented by a couple taxa. Temperate to cool marine climate.
• SPECIFIC LITHOLOGY: No lithology data reported in text, other than calcareous and rubble (suggesting lithified). A calcareous siliciclastic lithology is hence assigned. LITHIFICATION: Lithified, based on comments that material was derived from fragmented rubble.

Size class: macrofossils

Collection methods: COLLECTOR: Unknown collector, perhaps T. Matsumoto (fisherman). REPOSITORY: Yamaguchi Prefectural Museum.

Primary reference: K. Okamoto and M. Ibaraki. 1988. Early Pleistocene fossil Mollusca from the sea of Japan off Yamaguchi Prefecture. Saito Ho-on Kai Special Publication 1:523-532 [A. Miller/A. Hendy/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 62297: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Representative, though not necessarily retaing ecologic fidelity as material was dredged from a local area of sea floor. NOMENCLATURE: Not an authoritative publication, slightly outdated nomenclature, many taxa no identified to species resolution and limited used of sugeneric classification.
unclassified
  -
Thecostraca
 Balanomorpha - Balanidae
"Balanus" sp. Da Costa 1778 barnacle
Rhynchonellata
 Terebratulida - Terebrataliidae
Coptothyris grayi Davidson 1852
Bivalvia
 Pectinida - Pectinoidae
Mizuhopecten tokyoensis scallop
Subspecies: M. tokyoensis hokurikuensis
? Mizuhopecten sp. Masuda 1963 scallop
Mizuhopecten yessoensis Jay 1857 scallop
Subspecies: M. yessoensis yokoyamae
Amussiopecten praesignis Yokoyama 1922 scallop
 Arcida - Arcidae
 Carditida - Carditidae
? Miodontiscus sp. Dall 1903 clam
Miodontiscus prolongatus Carpenter 1864 clam
Subspecies: M. prolongatus nakamurai
Cyclocardia ferruginea Clessin 1888 clam
Subspecies: C. ferruginea orbicularis
 Cardiida - Cardiidae
? Clinocardium sp. Keen 1936 cockle
 Cardiida - Mactridae
? Mactra sp. Linnaeus 1767 clam
 Cardiida - Veneridae
? Venus sp. Linnaeus 1758 venus clam
 Pholadida - Corbulidae
"Anisocorbula venusta" = Corbula (Anisocorbula)
"Anisocorbula venusta" = Corbula (Anisocorbula) clam
 Lucinida - Lucinidae
Lucinoma sp., "Lucinoma cf. annulata" = Lucinoma annulatum
Lucinoma sp. Dall 1901 clam
"Lucinoma cf. annulata" = Lucinoma annulatum Reeve 1850 clam
Gastropoda
 Sorbeoconcha - Vermetidae
Serpulorbis sp. Sasso 1827 worm shell
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell
Echinoidea
 Clypeasteroida - Dendrasteridae