Loc. 1, horizion 2, Hiraiga: Late Aptian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Cucullaeidae
Bivalvia - Pholadomyida - Pholadomyidae
Bivalvia - Carditida - Astartidae
Bivalvia - Trigoniida - Megatrigoniidae
see common names

Geography
Country:Japan State/province:Iwate
Coordinates: 39.9° North, 141.9° East (view map)
Paleocoordinates:48.2° North, 151.2° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous
10 m.y. bin: Cretaceous 2-3
Key time interval: Late Aptian
Age range of interval: 119.57 - 113.2 m.y. ago
Stratigraphy
Geological group:Miyako Formation:Tanohata
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:"cross stratification",bioturbation sandstone
Lithology description: dominated by conglomerate, gravelly sandstone, and cross-stratified sandstone
Environment:transition zone/lower shoreface
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Spatial resolution:allochthonous
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:field collection
Reason for describing collection:paleoecologic analysis
Metadata
Database number:142433
Authorizer:M. Aberhan Enterer:T. Schossleitner
Research group:marine invertebrate
Created:2013-04-11 19:39:02 Last modified:2025-02-22 15:12:02
Access level:the public Released:2013-04-11 19:39:02
Creative Commons license:CC0
Reference information

Primary reference:
46243. T. Komatsu, K. Yoshihara, M. H. Dick, R. Takashima, A. Ostrovsky and H. Nishi. 2008. Habitats of Bivalves in the Lower-Cretaceous Aptian Tanohata and Aptian to Albian Hiraiga Formations, Iwate Prefecture, Northeastern Japan. In H. Okada, S. F. Mawatari, N. Suzuki, P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proceedings of International Symposium “The Origin and Evolution of Natural Diversity”, 1–5 October 2007, Sapporo 163-170 [M. Aberhan/T. Schossleitner]