Road cliff at Shinjo-cho, Shobara City: Langhian, Japan
collected by T. Yamaoka, H. Ohsawa
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Turridae
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Gemmula sp.
(Weinkauff 1875)
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Gastropoda
- Cassidae
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Phalium yokoyamai
Nomura and Hatai 1933
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| recombined as Liracassis yokoyamai | |||||||
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Cephalopoda
- Nautilida
- Aturiidae
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Aturia cubaensis
(Lea 1841)
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Scaphopoda
- Dentaliida
- Dentaliidae
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Fissidentalium yokoyamai
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Bivalvia
- Cardiida
- Tellinidae
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Macoma sp.
Leach 1819
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea sp.
Linnaeus 1758
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Bivalvia
- Nuculida
- Nuculidae
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Ennucula sp.
Iredale 1931
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Acila submirabilis
Makiyama 1926
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| recombined as Acila (Acila) submirabilis | |||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 34.9° North, 133.0° East (view map) |
| Paleocoordinates: | 37.6° North, 130.3° East |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Langhian | 10 m.y. bin: | Cenozoic 5 |
| Key time interval: | Langhian | ||
| Age range of interval: | 15.98000 - 13.82000 m.y. ago |
Stratigraphy
| Geological group: | Bihoku | Formation: | Itabashi | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "Early Middle Miocene". Yamamoto & Sato (1999) suggested an NN4/NN5 age from calcareous nannoplankton (upper Burdigalian-Langhian), and Takemura et al. (2003) assigned the Itabashi Formation and the underlying Korematsu Formation to N8 planktonic zone (uppermost Burdigalian-Langhian), both suggesting a Langhian age for the locality. | |||||
Lithology and environment
| Primary lithology: | siltstone |
| Environment: | offshore |
| Geology comments: "Subneritic to bathyal zones" according to Tomida et al. (1999). Molluscan fauna includes euneritic to subneritic inhabitants of the muddy bottom, and some with a little shallower habitat. Tomida et al. (2002) described environment as "sublittoral." Lithology and molluscan faunas therefore suggest an offshore environment. | |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collectors: | T. Yamaoka, H. Ohsawa |
Metadata
| Database number: | 179868 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2016-07-03 10:21:47 | Last modified: | 2019-08-12 23:35:19 |
| Access level: | the public | Released: | 2016-07-03 10:21:47 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 59673. | S. Tomida, Y. Okumura, T. Yamaoka, H. Ohsawa, and N. Hamada. 2002. Occurrence of Aturia (Cephalopoda: Nautilida) from the Miocene Bihoku Group of Hiroshima Prefecture, southwestern Japan. Bulletin of the Mizunami Fossil Museum 29:151-156 [M. Clapham/M. Clapham] |