Locality 07. Roadside exposure ~600 meters northwest of Masuno, Oniki-Machi: Maastrichtian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Parallelodontidae
Bivalvia - Protobranchia - Sareptidae
Bivalvia - Arcida - Glycymerididae
Bivalvia - Trigoniida - Megatrigoniidae
Apiotrigonia dubia Tashiro 1979
Bivalvia - Pholadida - Corbulidae
Tashiro and Otsuka 1982
Bivalvia - Venerida - Arcticidae
Tashiro and Otsuka 1982
Tashiro and Otsuka 1982
Bivalvia - Venerida - Veneridae
Tashiro and Otsuka 1982
Bivalvia - Lucinida - Lucinidae
Myrtea sp. Turton 1822
Tashiro and Otsuka 1982
Bivalvia - Lucinida - Mactromyidae
Tashiro and Otsuka 1982
Bivalvia - Adapedonta - Pharidae
Tashiro and Otsuka 1982
see common names

Geography
Country:Japan State/province:Kumamoto County:Amakusa
Coordinates: 32.2° North, 130.0° East (view map)
Paleocoordinates:36.6° North, 122.1° East (Wright 2013)
Basis of coordinate:based on political unit
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Maastrichtian 10 m.y. bin: Cretaceous 8
Key time interval: Maastrichtian
Age range of interval: 72.2 - 66 m.y. ago
Stratigraphy
Geological group:Himenoura Formation:Himenoura U-IV Member:U-IVb
Stratigraphic resolution:member
Lithology and environment
Primary lithology: silty sandstone
Lithology description: silty sandstone
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some genera
Reason for describing collection:taxonomic analysis
Metadata
Database number:275578
Authorizer:P. Wagner Enterer:P. Wagner
Modifier:P. Wagner
Created:2025-10-16 11:25:17 Last modified:2025-10-16 11:34:14
Access level:the public Released:2026-04-16 11:25:17
Creative Commons license:CC0
Reference information

Primary reference:
93253. M. Tashiro and M. Otsuka. 1980. Bivalve fossils from the Uppermost Formation of the Upper Himenoura Subgroup in Amakusa Shimojima island, Kyushu, Part 1. Memoirs of the Faculty of Science, Kochi University, Series E 1:41-57 [P. Wagner/P. Wagner]

Secondary references:

93252 M. Tashiro and M. Otsuka. 1982. Bivalve fossils from the Uppermost Formation of the Upper Himenoura Subgroup in Amakusa Shimojima island. Memoirs of the Faculty of Science, Kochi University, Series E 3:7-22 [P. Wagner/P. Wagner]