Locality 1 (Arakida Formation): Early Miocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Scaphopoda
- Dentaliida
- Dentaliidae
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Scaphopoda
- Dentaliida
- Laevidentaliidae
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Laevidentalium sp.
(Cossmann 1888)
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Gastropoda
- Turritellidae
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Turritella sp.
Lamarck 1799
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r category | ||||||
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Cephalopoda
- Octopoda
- Argonautidae
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Bivalvia
- Protobranchia
- Nuculanidae
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Bivalvia
- Protobranchia
- Malletiidae
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Bivalvia
- Protobranchia
- Yoldiidae
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Yoldia sp.
Möller 1842
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r category | ||||||
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Yoldia sagittalia
Yokoyama 1925
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r category | ||||||
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Bivalvia
- Cardiida
- Tellinidae
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Macoma sp.
Leach 1819
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Bivalvia
- Thraciida
- Periplomatidae
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Periploma sp.
Schumacher 1816
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Bivalvia
- Limida
- Limidae
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Geography
| Country: | Japan | State/province: | Nagano | County: | Yamadakawachi |
| Coordinates: | 35.8° North, 137.9° East (view map) | ||||
| Paleocoordinates: | 35.8° North, 135.0° East (Wright 2013) | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Early Miocene | ||
| Age range of interval: | 23.04 - 15.98 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | lithified mudstone |
| Includes fossils? | Y |
| Lithology description: Mudstone | |
| Environment: | deep-water indet. |
| Geology comments: From faunal composition this looks like an offshore-deep-water environment (100-250 m). | |
Taphonomy
| Modes of preservation: | body,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Repository of material is not known. | |
| Taxonomic list comments:Exhaustive for a depauperate fauna. Nomenclature appears to be of good quality. | |
Metadata
| Database number: | 51576 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2005-06-08 11:09:02 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | group members | Released: | 2006-06-08 11:09:02 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 13720. | A. Suzuki. 1995. Cephalopod fossil from the miocene Tomikusa Group in the southern part of Nagano Prefecture, central Japan. Bulletin of the Mizunami Fossil Museum 22:115-120 [A. Miller/A. Hendy/A. Hendy] |