Shizukawa Area, Niranohama Formation, Honshu: Hettangian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Cucullaeidae
Bivalvia - Arcida - Parallelodontidae
Bivalvia - Ostreida - Malleidae
Bivalvia - Ostreida - Bakevelliidae
Bivalvia - Ostreida - Pteriidae
Bivalvia - Mytilida - Mytilidae
Bivalvia - Carditida - Astartidae
Bivalvia - Trigoniida - Trigoniidae
possibly conspecific with G. hosourensis
Geratrigonia hosourensis (Yokoyama 1904)
Bivalvia - Trigoniida - Myophorellidae
Vaugonia (Vaugonia) niranohamensis Kobayashi and Mori 1955
Bivalvia - Poromyida - Cuspidariidae
Bivalvia - Thraciida - Thraciidae
Bivalvia - Cardiida - Cardiidae
Bivalvia - Venerida - Neomiodontidae
see common names

Geography
Country:Japan State/province:Miyagi
Coordinates: 38.7° North, 141.4° East (view map)
Paleocoordinates:53.0° North, 171.4° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period: Jurassic Epoch: Early Jurassic
Stage: Hettangian 10 m.y. bin: Jurassic 1
Key time interval: Hettangian
Age range of interval: 201.4 - 199.5 m.y. ago
Stratigraphy
Geological group:Shizukawa Formation:Niranohama
Stratigraphic resolution:formation
Lithology and environment
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:40541
Authorizer:M. Aberhan Enterer:S. Nurnberg
Modifier:S. Nurnberg Research group:marine invertebrate
Created:2004-06-25 01:08:33 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-06-25 01:08:33
Creative Commons license:CC0
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]