Where: Japan (44.4° N, 141.7° E: paleocoordinates 46.6° N, 138.0° E)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Sakasagawa Formation, Late/Upper Eocene (37.2 - 33.9 Ma)
• STRATIGRAPHIC RELATIONS: From "Sakasagawa" Fm , which unconformably overlies the Sankebetsu Fm (Ealry Miocene) and unconformably overlies the Early Eocene Haboro Fm. THICKNESS: Unknown thickness of unit. AGE: Late Eocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: Collection a composite list for entire formation.
• formation-level stratigraphic resolution
Environment/lithology: coastal; lithified sandstone
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 70424: authorized by Austin Hendy, entered by Austin Hendy on 22.03.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Conchocele bisecta Conrad 1849 clam | |
Periploma (Periploma) pulchella Hatai and Nisiyama 1949 clam | |
Mya convexa Noda 1992 softshell clam
"Mya salmonensis" = Mya (Mya) salmonensis Clark 1932 softshell clam
Mya (Mya) truncata Linnaeus 1758 softshell clam | |
Callista (Ezocallista) kurodae venus clam
Pitar (Neogenella) okadana venus clam | |
Nemocardium (Nemocardium) yokoyamai Takeda 1953 cockle
Papyridea (Profulvia) harrimani Dall 1904 cockle | |
Cyclocardia eoensis clam | |
Acila (Acila) brevis Nagao and Huzioka 1941 divaricate nutclam | |
Yoldia (Orthoyoldia) haboroensis Uozumi 1957 pointed nut clam | |
Yoldia (Yoldia) biremis Uozumi 1957 clam |