Sankebetsu Fm (upper part) (Miocene of Japan)

Where: Japan (44.4° N, 141.7° E: paleocoordinates 45.1° N, 139.8° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Sankebetsu Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From Sankebetsu Fm (Sankebetsu Sandstone), which unconformably overlies the Sakasagawa Fm (Late Eocene) and is unconformably overlain by the Chikubetsu Fm (Middle Miocene). THICKNESS: Unknown thickness of unit. AGE: Early Miocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: Upper part of formation.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, silty sandstone

• ENVIRONMENT: Offshore siliciclastic environment.
• SPECIFIC LITHOLOGY: Alternating beds of sandstone and siltstone. LITHIFICATION: Presumably lithified, on the basis of age.

Size class: macrofossils

Collection methods: COLLECTOR: Based on previous collectors (see Noda 1992, 1995). REPOSITORY: Unknown repository.

Primary reference: A. I. Kafanov, K. Ogasawara, and Y. Noda. 2005. Cenozoic molluscan (Bivavia) cenozone of Hokkaido, Northern Japan. Science Report, Institute of Geosciences, Univeristry of Tsukuba 26:1-12 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 70423: authorized by Austin Hendy, entered by Austin Hendy on 22.03.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Only includes characteristic bivalvia; other taxa not listed, possibly reported in Noda (1992, 1995). NOMENCLATURE: Not an authoritative publication, but with very current nomenclature and subgenus/species resolution identifications.
Show authors, comments, and common names
Bivalvia
 Nuculanida - Sareptidae
Megayoldia (Hataiyolida) hayasakai, Megayoldia (Hataiyolida) tokungai
 Pholadida - Pholadidae
Penitella kotakae
 Pholadida - Myidae
Platyodon nipponica
Platyodon nipponica Uozumi and Fujie 1956 softshell clam
 Cardiida - Cardiidae
Nemocardium (Nemocardium) yokoyamai
 Cardiida - Tellinidae
Macoma optiva
Macoma optiva tellin clam