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
Scaphopoda - Dentaliida - Dentaliidae
Cephalopoda - Nautilida - Aturiidae
Gastropoda - Neogastropoda - Turridae
Gemmula sp. (Weinkauff 1875)
Gastropoda - Cassidae
Phalium yokoyamai Nomura and Hatai 1933
Bivalvia - Protobranchia - Nuculidae
Acila submirabilis Makiyama 1926
Ennucula sp. Iredale 1931
Bivalvia - Cardiida - Tellinidae
Macoma sp. Leach 1819
Bivalvia - Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758
see common names

Geography
Country:Japan
Coordinates: 34.9° North, 133.0° East (view map)
Paleocoordinates:34.4° North, 130.7° East (Wright 2013)
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: 15.98 - 13.82 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:2025-02-22 15:12:02
Access level:the public Released:2016-07-03 10:21:47
Creative Commons license:CC0
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]