Member A, Soya area (Cretaceous of Japan)

Also known as Loc. W4A

Where: Japan (45.5° N, 141.9° E: paleocoordinates 50.1° N, 130.0° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Ohimisaki Formation, Early/Lower Campanian (83.5 - 70.6 Ma)

• STRATIGRAPHIC RELATIONS: From "Member A" of the Ohimisaki Fm, which is overlain by the Orannai Fm. AGE: Early Campanian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From base of regional section.

• member-level stratigraphic resolution

Environment/lithology: coastal; lithified, nodular, calcareous mudstone

• ENVIRONMENT: Not stated in text, but presumably a shallow siliciclastic setting.
• SPECIFIC LITHOLOGY: Mudstone containing calcareous nodules. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: mold/impression

Collection methods: COLLECTOR: Not stated, but presumably the authors T. Matsumoto and T. Miyauchi. REPOSITORY: Dept. of Geology, Kyushu University, Japan.

Primary reference: T. Matsumoto. 1984. Part I. Ammonites from the Upper Campanian of the Teshio Mountains. Palaeontological Society of Japan Special Papers 27:5-32 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87034: authorized by Austin Hendy, entered by Austin Hendy on 01.03.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to characteristics ammonites described in text. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications.
 Ammonitida - Pachydiscidae