Nishikurosawa Fm - Loc.# 1 (Miocene of Japan)

Where: Japan (39.7° N, 140.1° E: paleocoordinates 42.4° N, 137.5° E)

• outcrop-level geographic resolution

When: Nishikurosawa Formation, Middle Miocene (16.0 - 11.6 Ma)

• STRATIGRAPHIC RELATIONS: From Nishikurosawa Fm, which rests unconformably above the Daikima Flora of the Daijima Formation (Middle Miocene), and conformably below the Onnagawa Fm (Middle Miocene). THICKNESS: From restricted bed within formation of 20-100 m total thickness. AGE: Middle Miocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed within lower part of the Nishikurosawa Fm.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, fine-grained, carbonaceous sandstone and lithified, carbonaceous siltstone

• ENVIRONMENT: No environmental data reported in text.
• SPECIFIC LITHOLOGY: Compact, fine grained sandstone and siltstone with abundant carbonaceous matters; stratified in upper part, massive in lower part. LITHIFICATION: Lithified, on the basis of facies description and preservation as molds and casts.

Size class: macrofossils

Preservation: cast, mold/impression, original calcite

Collection methods: surface (in situ),

• COLLECTOR: K. Ogasawara. REPOSITORY: IGPS, Institute of Geology and Paleontology, Tohoku University.

Primary reference: K. Ogasawara. 1973. Molluscan fossils from the Nishikurosawa Formation, Oga Peninsula, Akita Prefecture, Japan. Tohoku University, Science Report, 2nd ser. (Geol.), Special Volume (Hatai Memorial Volume) 6:137-155 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 70295: authorized by Austin Hendy, entered by Austin Hendy on 20.03.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Authoritative publication with relatively current nomenclature and species-level assignments.
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Bivalvia
 Nuculanida - Nuculanidae
Nuculana cf. confusa Hanley 1860 pointed nut clam
Saccella sp. Woodring 1925 pointed nut clam
Saccella saikaiensis pointed nut clam
 Arcida - Arcidae
 Arcida - Limopsidae
 Ostreida - Ostreidae
 Hiatellida - Hiatellidae
"Panopaea sp." = Panopea
"Panopaea sp." = Panopea Menard 1807 clam
 Cardiida - Tellinidae
"Fabulina sp." = Tellina (Fabulina) tellin clam
 Cardiida - Cardiidae
"Clinocardium shinjiense" = Ciliatocardium shinjiense, Clinocardium sp.
"Clinocardium shinjiense" = Ciliatocardium shinjiense Yokoyama 1923 cockle
Clinocardium sp. Keen 1936 cockle
 Cardiida - Veneridae
Dosinia nomurai Otuka 1934 venus clam
Leukoma itoigawae venus clam
 Cardiida - Ungulinidae
Diplodonta sp. Bronn 1831 clam
Gastropoda
 Neogastropoda - Nassariidae