Sakawa Area, Lower Monobegawa Group, Shikoku: Neocomian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Trigoniida - Trigoniidae
Rutitrigonia yeharai
Nipponitrigonia sakamotoensis
Nipponitrigonia convexa
Nipponitrigonia kikuchiana (Yokoyama 1891)
Bivalvia - Trigoniida - Megatrigoniidae
Pterotrigonia (Pterotrigonia) pocilliformis
Pterotrigonia (Pterotrigonia) hokkaidoana
see common names

Geography
Country:Japan State/province:Kochi
Coordinates: 33.5° North, 133.3° East (view map)
Paleocoordinates:41.1° North, 135.3° East
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
10 m.y. bin:Cretaceous 1-2
Key time interval:Neocomian
Age range of interval:145.00000 - 125.77000 m.y. ago
Stratigraphy
Geological group:Monobegawa
Stratigraphic resolution:formation
Stratigraphy comments: Lower Monobegawa Group, Upper Neocomian
Lithology and environment
Primary lithology: conglomerate
Secondary lithology: "shale"
Environment:marine indet.
Taphonomy
Modes of preservation:cast,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:40476
Authorizer:M. Aberhan Enterer:S. Nurnberg
Modifier:S. Nurnberg Research group:marine invertebrate
Created:2004-06-24 02:17:46 Last modified:2004-06-29 14:48:51
Access level:the public Released:2004-06-24 02:17:46
Creative Commons license:CC BY
Reference information

Primary reference:
10664. I. Hayami. 1975. A systematic survey of the Mesozoic Bivalvia from Japan. The University Museum, The University of Tokyo, Bulletin (10) [M. Aberhan/S. Nurnberg/S. Nurnberg]