M4 clay bed, Tsunozu Gp - Ida, Shimane Prefecture (Pleistocene of Japan)

Where: Japan (35.1° N, 132.4° E: paleocoordinates 35.4° N, 132.0° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Tsunozu Group, Early/Lower Pleistocene (2.6 - 0.8 Ma)

• STRATIGRAPHIC RELATIONS: M4 clay bed of the Tsunozu Group. AGE: In the Ida area, the Plio-Pleistocene boundary is placed just above the M3 clay bed of the Tsunozu Gp. Accordingly the age of the M4 clay be is considered to be somewhat younger than the 1.6 Ma.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; unlithified claystone

• 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 clay. LITHIFICATION: Presumed unlithified. No comments on lithification in text and no figures, but given age and lack of submarine burial, it is likely that this is an unlithified or poorly-lithified collection.

Size class: macrofossils

Collection methods: COLLECTOR: Imamura, Okamoto and Amimoto. 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 62301: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Representative, but probably not exhaustive second-hand list. NOMENCLATURE: Not an authoritative publication, slightly outdated nomenclature, but with species-level identifications and subgeneric classification.
Show authors, comments, and common names
unclassified
  -
? Nuttalia sp.
Gastropoda
 Cerithioidea - Batillariidae
Batillaria zonalis
 Sorbeoconcha - Tonnidae
? Tonna sp.
? Tonna sp. Brünnich 1772 tun shell
 Neogastropoda - Muricidae
Rapana cf. thomsoni
Bivalvia
 Solenida - Solenidae
Solen sp.
Solen sp. Linnaeus 1758 clam
 Pholadida - Corbulidae
"Anisocorbula venusta" = Corbula (Anisocorbula)
"Anisocorbula venusta" = Corbula (Anisocorbula) clam
 Cardiida - Trapezidae
Trapezium sp., Trapezium (Neotrapezium) sublaevigatum
Trapezium sp. Mühlfeld 1811 clam
 Cardiida - Veneridae
Ruditapes philippinarum, "? Callista chinensis" = Callista (Callista) chinensis, ? Cyclina sp.
"? Callista chinensis" = Callista (Callista) chinensis Holten 1802 venus clam
? Cyclina sp. venus clam
 Cardiida - Corbiculidae
Corbicula sp.
Corbicula sp. Megerle 1811 clam
 Cardiida - Tellinidae
"Macoma incongrua" = Macoma (Macoma) incongrua, "Nitidotellina nitidula" = Tellina (Nitidotellina), "? Moerella sp." = Tellina (Moerella)
"Macoma incongrua" = Macoma (Macoma) incongrua Martens 1865 tellin clam
"Nitidotellina nitidula" = Tellina (Nitidotellina) tellin clam
"? Moerella sp." = Tellina (Moerella) Fischer 1887 tellin clam
 Mytilida - Mytilidae
Musculista perfragilis, Musculista senhousia, Modiolus sp.
Musculista senhousia Benson 1842 mussel
Listed as "M. senhausia" - misspelling
Modiolus sp. Lamarck 1801 mussel
 Pectinida - Pectinoidae
Chlamys (Amuzapecten) nipponensis
 Pectinida - Anomiidae
Anomia chinensis
 Ostreida - Ostreidae
"Ostrea" sp.
"Ostrea" sp. Linnaeus 1758 oyster
 Arcida - Arcidae
Anadara sp.
Anadara sp. Gray 1847 ark