Nishikurosawa Fm - Loc.# 6: Middle Miocene, Japan
Where & when
Geology
Taphonomy & methods
Metadata & references
Geography
| Country: | Japan |
| Coordinates: | 39.7° North, 140.1° East (view map) |
| Paleocoordinates: | 39.5° North, 137.5° East (Wright 2013) |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Middle Miocene | ||
| Age range of interval: | 15.98 - 11.63 m.y. ago |
Stratigraphy
| Formation: | Nishikurosawa | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Nishikurosawa Fm, which rests unconformably above the Daikima Flora of the Daijima Formation (Middle Miocene), and conformably below the Onnagawa Fm (Middle Miocene). THICKNESS: From bed of about 5 m within formation of 20-100 m total thickness. AGE: Middle Miocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed within lower part of the Nishikurosawa Fm. | |||||
Lithology and environment
| Primary lithology: | brown,gray lithified siltstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Brownish gray siltstone. LITHIFICATION: Lithified, on the basis of preservation as molds and casts. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: No environmental data reported in text. | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression |
| Degree of concentration: | dispersed |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | poor |
| Disassociated major elements: | all |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: COLLECTOR: K. Ogasawara. REPOSITORY: IGPS, Institute of Geology and Paleontology, Tohoku University. | |
| Taxonomic list comments:COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Authoritative publication with relatively current nomenclature and species-level assignments. | |
Metadata
| Database number: | 70305 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-03-20 18:21:04 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | authorizer only | Released: | 2007-03-20 18:21:03 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 23595. | K. Ogasawara. 1973. Molluscan fossils from the Nishikurosawa Formation, Oga Peninsula, Akita Prefecture, Japan. Tohoku University, Science Report, 2nd ser. (Geol.), Special Volume (Hatai Memorial Volume) 6:137-155 [A. Hendy/A. Hendy] |