Middle stream of the Haboro River: Langhian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Malacostraca - Decapoda - Cyclodorippidae
Tymolus ingens Takeda and Tomida 1984
Bivalvia - Venerida - Mactridae
Bivalvia - Venerida - Veneridae
Bivalvia - Cardiida - Cardiidae
Serripes sp. Gould 1841
Bivalvia - Arcida - Arcidae
Anadara sp. Gray 1847
see common names

Geography
Country:Japan
Coordinates: 44.3° North, 141.8° East (view map)
Paleocoordinates:44.3° North, 138.7° East (Wright 2013)
Basis of coordinate:estimated from map
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:Chikubetsu
Stratigraphic resolution:group of beds
Stratigraphy comments: Lower member of the Chikubetsu Formation. The so-called Chikubetsu-Onishibetsu horizon is correlated to the Denticulopsis lauta Zone by diatom biostratigraphy (Maruyama, 1981). Based upon these data, the geologic age of the Chikubetsu Formation is assigned to the early Middle Miocene.
Lithology and environment
Primary lithology:massive,bioturbation lithified sandstone
Lithology description: Intensely bioturbated, massive sandstone
Environment:transition zone/lower shoreface
Geology comments: Lower shoreface to inner shelf. Sandy bottom of an upper neritic zone.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Mizunami Fossil Museum
Metadata
Database number:127690
Authorizer:C. Schweitzer, M. Clapham Enterer:E. Johnson, M. Clapham
Modifier:M. Clapham Research group:decapod,marine invertebrate
Created:2012-05-22 02:51:29 Last modified:2025-02-22 15:12:02
Access level:the public Released:2012-05-22 02:51:29
Creative Commons license:CC0
Reference information

Primary reference:
41703.decapod H. Kato, A. Suzuki, and H. Karasawa. 1994. A new record of Tymolus ingens Takeda & Tomida, 1984 (Crustacea: Decapoda: Brachyura) from the Miocene Chikubetsu Formation, Northern Hokkaido, Japan. Bulletin of the Mizunami Fossil Museum 21:77-81 [C. Schweitzer/E. Johnson/M. Clapham]