Off Kawashiri-misaki - Early Pleistocene, Yamaguchi Prefecture (Pleistocene of Japan)

Where: Yamaguchi, Japan (34.8° N, 130.6° E: paleocoordinates 35.1° N, 130.2° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Early/Lower Pleistocene (2.6 - 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: estuary or bay; lithified, calcareous siliciclastic sediments

• BATHYMETRY: Embayment. 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 62300: 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 NOMENCLATURE: Not an authoritative publication, slightly outdated nomenclature, many taxa no identified to species resolution and limited used of sugeneric classification.
Show authors, comments, and common names
Thecostraca
 Balanomorpha - Balanidae
"Balanus" sp.
"Balanus" sp. Da Costa 1778 barnacle
Gastropoda
 Neogastropoda - Buccinidae
Volutharpa perryi, "Searlesia fuscolabiata" = Searlesia modesta
"Searlesia fuscolabiata" = Searlesia modesta Gould 1860 true whelk
Bivalvia
 Pectinida - Pectinoidae
Chlamys sp., Chlamys (Azumapecten) cf. nipponensis
Chlamys sp. Röding 1798 scallop
 Arcida - Cucullaeidae
"Arca boucardi" = Tetrarca boucardi
"Arca boucardi" = Tetrarca boucardi Jousseaume 1894 clam
 Lucinida - Lucinidae
"Lucinoma annulata" = Lucinoma annulatum
"Lucinoma annulata" = Lucinoma annulatum Reeve 1850 clam
 Pholadida - Myidae
"Mya (Arenomya) cf. japonica" = Mya (Arenomya) arenaria
"Mya (Arenomya) cf. japonica" = Mya (Arenomya) arenaria Linnaeus 1758 softshell clam
 Pholadida - Corbulidae
"? Anisocorbula sp." = Corbula (Anisocorbula)
"? Anisocorbula sp." = Corbula (Anisocorbula) Iredale 1930 clam
 Cardiida - Veneridae
Callithaca adamsi, Saxidomus purpuratus
Callithaca adamsi Reeve 1863 venus clam
 Cardiida - Ungulinidae
"Felaniella usta" = Diplodonta
"Felaniella usta" = Diplodonta clam