Akaisi, Natori-gun: Langhian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Terebratulida - Terebrataliidae
Coptothyris grayi (Davidson 1852)
see common names

Geography
Country:Japan
Coordinates: 38.2° North, 140.8° East (view map)
Paleocoordinates:38.1° North, 138.1° East (Wright 2013)
Basis of coordinate:based on nearby landmark
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
Formation:Moniwa
Stratigraphic resolution:group of beds
Stratigraphy comments: From the Moniwa beds in the broad sense (Akaisi beds are impure limestone that occupies the lower part). Moniwa Formation ranges from 16-15 Ma, according to Ogasawara (1994).
Lithology and environment
Primary lithology:very coarse,pebbly,shelly/skeletal poorly lithified sandstone
Lithology description: Described as "impure limestone" by Hatai but the Coptothyris assemblages are in pebbly-granule coarse sandstones, partly with impure limestone, according to Sato (1991). It is likely that the impure limestone are more shell-rich intervals of the sandstone.
Environment:shoreface
Geology comments: Interpreted as tidal zone to shallow marine, gravelly and rocky bottom by Sato (1991)
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:190765
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2017-12-17 21:45:15 Last modified:2025-02-22 15:12:02
Access level:the public Released:2017-12-17 21:45:15
Creative Commons license:CC0
Reference information

Primary reference:
64049. K. M. Hatai. 1940. The Cenozoic Brachiopoda of Japan. Science Reports, Tohoku Imperial University, Series 2 20:1-413 [M. Clapham/M. Clapham]