Ainoshima Island (KMNH collection): Rupelian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chondrichthyes
- Hexanchiformes
- Hexanchidae
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| 7 specimens | ||||||||||
| KMNH VP 100,074-077, 080-082 | ||||||||||
| 4 specimens | ||||||||||
| KMNH VP 100,078, 079, 083, 084 | ||||||||||
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Chondrichthyes
- Squatiniformes
- Squatinidae
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Squatina sp.
Dumeril 1806
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1 specimen | |||||||||
| KMNH VP 100,109 | ||||||||||
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Chondrichthyes
- Squaliformes
- Squalidae
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| 1 specimen | ||||||||||
| KMNH VP 100,107 | ||||||||||
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Chondrichthyes
- Myliobatiformes
- Myliobatidae
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Myliobatis sp.
Cuvier 1816
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1 specimen | |||||||||
| KMNH VP 100,111 | ||||||||||
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Chondrichthyes
- Lamniformes
- Cetorhinidae
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Cetorhinus sp.
de Blainville 1816
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1 specimen | |||||||||
| KMNH VP 100,108 | ||||||||||
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Chondrichthyes
- Lamniformes
- Lamnidae
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Isurus desori
(Sismonda 1849)
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1 specimen | |||||||||
| KMNH VP 100,094 | ||||||||||
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Chondrichthyes
- Lamniformes
- Otodontidae
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| Yabumoto 1987 | 4 specimens | |||||||||
| KMNH VP 100,092; 100,093; 100,112; 100,116 | ||||||||||
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Chondrichthyes
- Lamniformes
- Odontaspididae
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| 6 specimens | ||||||||||
| KMNH VP 100,095-100 | ||||||||||
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Chondrichthyes
- Carcharhiniformes
- Triakidae
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Galeorhinus sp.
de Blainville and Prévost 1816
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1 specimen | |||||||||
| KMNH VP 100,106 | ||||||||||
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Chondrichthyes
- Carcharhiniformes
- Carcharhinidae
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Carcharhinus spp.
de Blainville 1816
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3 specimens | |||||||||
| KMNH VP 100,101-103 | ||||||||||
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Negaprion sp.
Whitley 1940
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1 specimen | |||||||||
| KMNH VP 100,105 | ||||||||||
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Chondrichthyes
- Carcharhiniformes
- Galeocerdonidae
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Galeocerdo sp.
Müller and Henle 1837
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1 specimen | |||||||||
| KMNH VP 100,104 | ||||||||||
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Chondrichthyes
- Heterodontiformes
- Heterodontidae
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Heterodontus sp.
de Blainville 1816
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5 specimens | |||||||||
| KMNH VP 100,085-089 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 34.0° North, 130.8° East (view map) |
| Paleocoordinates: | 36.5° North, 127.6° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Rupelian | ||
| Age range of interval: | 33.9 - 27.3 m.y. ago |
Stratigraphy
| Formation: | Yamaga | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: The age of the Yamaga Formation in the Ashiya area was placed at 31.7±2.3 Ma (upper Lower Oligocene) based on fission track dating (Ozaki and Hamasaki, 1991). This was supported by further fission track dating and biostratigraphic studies conducted in the upper and lower formations (Tsuchi et al., 1987; Ozaki and Hamasaki, 1991; Okada, 1992). The Ashiya Group is correlated with the calcareous nannofossil Subzone CP19a of Okada and Bukry (1980) (Okada, 1992) and the planktonic foraminiferal Subzone P21a of Berggren and Miller (1988) (Ibaraki, 1994). | |||||
Lithology and environment
| Primary lithology: | "siliciclastic" |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
| Collection method comments: Repository: Kitakyushu Museum of Natural History | |
| Taxonomic list comments:Some material actually from Kaijima Island, but provenance of specimens/taxa are not given so all are included here | |
Metadata
| Database number: | 278481 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | vertebrate |
| Created: | 2026-03-24 20:08:01 | Last modified: | 2026-03-24 21:02:28 |
| Access level: | the public | Released: | 0000-00-00 00:00:00 |
| Creative Commons license: |
Reference information
Primary reference:
| 94415. | T. Uyeno, Y. Yabumoto, and N. Kuga. 1984. Fossil fishes of Ashiya Group - 1 - Late Oligocene elasmobranchs from islands of Ainoshima and Kaijima, Kitakyushu. Bulletin of the Kitakyushu Museum of Natural History 5:135-142 [M. Clapham/M. Clapham] |
Secondary references:
| 94412 | Y. Yabumoto. 1987. Oligocene lamnid shark of the genus Carcharodon from Kitakyushi, Japan. Bulletin of the Kitakyushu Museum of Natural History 6:239-264 [M. Clapham/M. Clapham] |