Where: Japan (43.5° N, 142.0° E: paleocoordinates 46.7° N, 136.4° E)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Bibai Formation (Ishikari Group), Lutetian (47.8 - 41.3 Ma)
• STRATIGRAPHIC RELATIONS: From Bibai Fm, which overlies the Wakkanabi and underlies the Akabira Fm, all of the Ishikari Gp (Middle Eocene). THICKNESS: From unit which reaches a thickness of 100-250 m. AGE: early Middle Eocene according to Takano and Waseda (2003). Referred only to Eocene in Mizuno (1964). STRATIGRAPHIC POSITION: Composite checklist for formation from local area.
• formation-level stratigraphic resolution
Environment/lithology: marginal marine; lithified sandstone and lithified siltstone
Size class: macrofossils
Preservation: cast, mold/impression
Collection methods: COLLECTOR: T. Mizuno (c. 1960's). REPOSITORY: Unknown, not stated in text.
Primary reference: A. Mizuno. 1964. Summary of the Paleogene molluscan faunas in North Japan. Geological Survey of Japan Report 207 [A. Hendy/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 70902: authorized by Austin Hendy, entered by Austin Hendy on 11.04.2007, edited by Bethany Allen
Creative Commons license: CC BY (attribution)
Taxonomic list
Sequoia langsdorfii Heer 1877 coast redwood
Glyptostrobus sp. Endlicher 1847 Chinese swamp cypress
Taxodium distichum Linnaeus 1753 bald cypress | |
Angiospermae | |
Populus sp. Linnaeus 1753 poplar | |
Cinnamomum sp. Schaeffer 1760 cinnamon | |
Sabalites nipponica fan palm | |
Reptilia | |
Sinohadrianus ezoensis n. sp.
Sinohadrianus ezoensis n. sp. Shikama 1953 turtle Unnumbered specimen in Institute of Geology and Mineralogy, Hokkaido University (holotype), carapace. Collected from "incline No. 19" at the Utashinai Coal Mine.
| |
Gastropoda | |
Paludina sp. FĂ©russac 1812 snail | |
Bivalvia | |
Unio sp. Philipsson 1788 freshwater mussel | |
Corbicula tokudai clam | |
"Modiola sp." = Modiolus, Brachidontes ? sakakurai
"Modiola sp." = Modiolus Lamarck 1801 mussel
Brachidontes ? sakakurai mussel | |
"Margaritifera perdahurica" = Pinctada
"Margaritifera perdahurica" = Pinctada pearl oyster | |
Ostrea eorivularis Oyama and Mizuno 1958 oyster |