Loc. M-39 - River Kajisako [Nagase Fm] (Cretaceous of Japan)

Also known as Loc. N-6

Where: Japan (33.8° N, 134.0° E: paleocoordinates 46.9° N, 127.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Nagase Formation, Cenomanian (100.5 - 93.9 Ma)

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

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, medium-grained, coarse sandstone

• ENVIRONMENT: Shallow marine siliciclastic setting.
• SPECIFIC LITHOLOGY: Coarse-medium grained sandstone LITHIFICATION: Lithified, on the basis of figured specimens and preservation.

Size class: macrofossils

Preservation: mold/impression

Collection methods: COLLECTOR: Multiple collectors. REPOSITORY: Dept. of Geology, Kyushu University and Odochi Elementary School, 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 87006: authorized by Austin Hendy, entered by Austin Hendy on 27.02.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Probably not exhaustive, but including ammonoidea, inoceramids, bivalves, and radiolarians. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications.
Cephalopoda
 Ammonitida - Acanthoceratidae
"Calycoceras cf. orientale" = Calycoceras (Newboldiceras) orientale
"Calycoceras cf. orientale" = Calycoceras (Newboldiceras) orientale Matsumoto et al. 1957 ammonite
Bivalvia
 Mytilida - Mytilidae
Septifer mifunensis Tamura 1976 mussel
 Arcida - Glycymerididae
 Trigoniida - Megatrigonioidae
Pseudotrigonia (Scabrotrigonia) monobeana, "Pseudotrigonia (Acanthotrigonia) higoensis" = Pterotrigonia (Acanthotrigonia) higoensis, "Pseudotrigonia (Acanthotrigonia) mashikensis" = Pterotrigonia (Acanthotrigonia) mashikensis
Pseudotrigonia (Scabrotrigonia) monobeana Tashiro and Kozai 1982 clam
"Pseudotrigonia (Acanthotrigonia) higoensis" = Pterotrigonia (Acanthotrigonia) higoensis Tamura and Tashiro 1967 clam
"Pseudotrigonia (Acanthotrigonia) mashikensis" = Pterotrigonia (Acanthotrigonia) mashikensis Tamura and Tashiro 1967 clam
 Cardiida - Mactridae
Cymbophora okadakensis Tamura 1977 clam
 Cardiida - Corbiculidae
Veloritina cf. matsumotoi Tamura 1977 clam