Akabira Formation, Ishikari Group: Bartonian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
unclassified
|
||||||||||
|
Cipangopaludina jimboi
|
||||||||||
|
Semisulcospira fiscina
|
||||||||||
|
Lanceolaria pisciformis
|
||||||||||
|
Bivalvia
- Mytilida
- Mytilidae
|
||||||||||
|
Brachidontes ogasawarai
|
||||||||||
|
Modiolus ishikariensis
|
||||||||||
|
Bivalvia
- Ostreida
- Ostreidae
|
||||||||||
|
Ostrea eorivularis
Oyama and Mizuno 1958
|
||||||||||
|
Bivalvia
- Ostreida
- Pteriidae
|
||||||||||
|
Margaritifera perdahurica
|
||||||||||
| synonym of Pinctada | ||||||||||
|
Bivalvia
- Unionida
- Unionidae
|
||||||||||
|
Unio uryuensis
|
||||||||||
|
Anodonta subjapanensis
|
||||||||||
|
Bivalvia
- Lucinida
- Thyasiridae
|
||||||||||
|
Thyasira bisecta
(Conrad 1849)
|
||||||||||
| recombined as Conchocele bisecta | ||||||||||
| SUBSPECIES: Thyasira bisecta omauri | ||||||||||
|
Bivalvia
- Thraciida
- Thraciidae
|
||||||||||
|
Thracia sekii
|
||||||||||
|
Bivalvia
- Thraciida
- Periplomatidae
|
||||||||||
|
Periploma teshimai
|
||||||||||
|
Bivalvia
- Pholadida
- Myidae
|
||||||||||
|
Mya ezoensis
Nagao and Inoue 1941
|
||||||||||
| recombined as Mya (Arenomya) ezoensis | ||||||||||
| COMMENTS: Includes Mya ezoensis akabirensis | ||||||||||
|
Bivalvia
- Cardiida
- Corbiculidae
|
||||||||||
|
Corbicula tokudai
|
||||||||||
|
Geloina hokkaidoensis
|
||||||||||
| spelled with current rank as Polymesoda (Geloina) | ||||||||||
|
Bivalvia
- Cardiida
- Veneridae
|
||||||||||
|
Microcallista munroei
|
||||||||||
| spelled with current rank as Callista (Microcallista) | ||||||||||
|
Bivalvia
- Carditida
- Crassatellidae
|
||||||||||
|
Crassatellites yessoensis
|
||||||||||
| synonym of Crassatella | ||||||||||
|
Bivalvia
- Carditida
- Carditidae
|
||||||||||
|
Venericardia cf. yoshidai
Nagao 1928
|
||||||||||
| recombined as Cyclocardia yoshidai | ||||||||||
|
Bivalvia
- Nuculanida
- Yoldiidae
|
||||||||||
|
Yoldia hokkaidoensis
|
||||||||||
|
Bivalvia
- Nuculanida
- Sareptidae
|
||||||||||
|
Portlandia ogasawarai
|
||||||||||
|
Bivalvia
- Nuculida
- Nuculidae
|
||||||||||
|
Acila shimoyamai
Oyama and Mizuno 1958
|
||||||||||
|
Gastropoda
- Neogastropoda
- Perissityidae
|
||||||||||
|
Nekewis sekii
|
||||||||||
|
Gastropoda
- Neogastropoda
- Buccinidae
|
||||||||||
|
"Siphonalia" ishikariensis
|
||||||||||
|
"Siphonalia" sakakurai
Mizuno 1954
|
||||||||||
|
Gastropoda
- Naticidae
|
||||||||||
|
Polinices ? nagahamai
|
||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 43.5° North, 142.0° East (view map) |
| Paleocoordinates: | 46.2° North, 137.6° East |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | local area |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Bartonian | 10 m.y. bin: | Cenozoic 3 |
| Key time interval: | Bartonian | ||
| Age range of interval: | 41.20000 - 37.71000 m.y. ago |
Stratigraphy
| Geological group: | Ishikari | Formation: | Akabira | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Akabira Fm, which overlies the Bibai and underlies the Ikushunbetsu Fm, all of the Ishikari Gp (Middle Eocene). THICKNESS: From unit which reaches a thickness of 350-600 m. AGE: late Middle Eocene according to Takano and Waseda (2003). Referred only to Eocene in Mizuno (1964). STRATIGRAPHIC POSITION: Composite checklist for formation from local area. | |||||
Lithology and environment
| Primary lithology: | lithified sandstone |
| Secondary lithology: | lithified siltstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Sandstone and siltstone wth many coal seams. LITHIFICATION: Assume to be lithified on the basis of age and photgraphic plates of Takano and Osamu (2003). | |
| Environment: | marginal marine indet. |
| Geology comments: ENVIRONMENT: Marine and non-marine faunal assemblage. | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: COLLECTOR: T. Mizuno (c. 1960's). REPOSITORY: Unknown, not stated in text. | |
| Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Somewhat antiquated, but with species-level identifications. | |
Metadata
| Database number: | 70903 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-11 08:35:50 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2008-04-11 08:35:50 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 23771. | A. Mizuno. 1964. Summary of the Paleogene molluscan faunas in North Japan. Geological Survey of Japan Report 207 [A. Hendy/A. Hendy/A. Hendy] |