Locality 5 - Shiratake Fm, Amakusa: Middle Eocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Turritellidae
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Colpospira tashiroi
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Gastropoda
- Naticidae
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Polinices eocenica
Nagao 1928
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| recombined as Neverita eocenica | |||||||
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Gastropoda
- Neogastropoda
- Buccinidae
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? Pseudoneptunea sp.
Kobelt 1882
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Gastropoda
- Neogastropoda
- Volutidae
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? Volutospina nishimurai
Nagao 1928
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Gastropoda
- Neogastropoda
- Muricidae
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Pseudoperissolax yokoyomai
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Gastropoda
- Thersiteidae
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"Orthaulax" japonicus
Nagao 1924
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Bivalvia
- Nuculanida
- Yoldiidae
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Yoldia sp.
Möller 1842
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Bivalvia
- Carditida
- Crassatellidae
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Crassatellites nipponensis
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| synonym of Crassatella | |||||||
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Bivalvia
- Carditida
- Carditidae
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Venericardia mandaica
(Yokoyama 1911)
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| recombined as Venericardia (Venericardia) mandaica | |||||||
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Venericardia nipponica
Yokoyama 1911
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| recombined as Venericardia (Venericor) nipponica | |||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 32.4° North, 130.2° East (view map) |
| Paleocoordinates: | 39.7° North, 124.1° East |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| 10 m.y. bin: | Cenozoic 2-3 | ||
| Key time interval: | Middle Eocene | ||
| Age range of interval: | 47.80000 - 37.71000 m.y. ago |
Stratigraphy
| Formation: | Shiratake | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Shiratake Fm, which conformably overlies the ?Early-Middle Eocene Akasaki Fm (and in places unconformably overlies Cretaceous sediments), and is conformably overlain by the Kyoragi Fm (Middle Eocene). THICKNESS: From bed within formation of group that attains a thickness of 100 m. AGE: Middle Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From upper part of formation. | |||||
Lithology and environment
| Primary lithology: | lithified silty sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Silty sandstone. LITHIFICATION: Presumed lithified on the basis of age. | |
| Environment: | marginal marine indet. |
| Geology comments: ENVIRONMENT: Marginal marine, siliciclastic environment. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (float),field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTOR: Y. Takai (uknown date). REPOSITORY: Not stated in text, unknown. | |
| Taxonomic list comments:COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments. | |
Metadata
| Database number: | 71022 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-14 20:15:36 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2008-04-14 20:15:36 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 23772. | A. Mizuno. 1964. Paleogene and Early Neogene molluscan faunae in West Japan. Geological Survey of Japan Report 204 [A. Hendy/A. Hendy] |