Loc. M-55 - River Kajisako [Nagase Fm] (Cretaceous of Japan)

Where: Japan (33.8° N, 134.0° E)

• Paleocoordinates: 40.0° N, 137.2° E (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Nagase Formation, Early/Lower Turonian (93.9 - 89.8 Ma)

• STRATIGRAPHIC RELATIONS: From the Nagase Fm, which is overlain by the Kajisako Fm. AGE: Early Turonian, on the basis of ammonite, inoceramid, and radiolarian biostratigraphy. STRATIGRAPHIC POSITION: From the lower lithostratigraphic unit in regional section; upper part of Nagase Fm.

• bed-level stratigraphic resolution

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

• ENVIRONMENT: Shallow marine siliciclastic setting.
• SPECIFIC LITHOLOGY: Fine-grained sandstone. LITHIFICATION: Lithified, on the basis of figured specimens and facies description.

Size class: macrofossils

Preservation: mold/impression

Collection methods: COLLECTOR: Multiple collectors. REPOSITORY: Dept. of Geology, Kyushu University, Japan.

Primary reference: M. Tashiro and T. Kozai. 1982. Part V. Bivalve fossils from the Upper Cretaceous of the Monobe area, Shikoku. Palaeontological Society of Japan Special Papers 25:69-92 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87008: authorized by Austin Hendy, entered by Austin Hendy on 27.02.2009

Creative Commons license: CC0 (CC0)

Taxonomic list

• COVERAGE: Probably not exhaustive, but including ammonoidea, inoceramids, bivalves, and radiolarians. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications.
Bivalvia
 Myalinida - Inoceramidae
 Nuculida - Nuculidae
Acila (Truncacila) hokkaidoensis Nagao 1932 divaricate nutclam