Loc. R3013, Kanajirisawa Creek, Obiracho: Middle Cenomanian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Turrilitidae
Turrilites acutus Passy 1832
Cephalopoda - Ammonitida - Desmoceratidae
Malacostraca - Decapoda - Goniodromitidae
see common names

Geography
Country:Japan State/province:Hokkaido County:Obiracho
Coordinates: 44.2° North, 142.1° East (view map)
Paleocoordinates:50.6° North, 147.0° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Cenomanian 10 m.y. bin: Cretaceous 5
Key time interval: Middle Cenomanian Ammonoid zone:  Desmoceras japonicum
Age range of interval: 100.5 - 93.9 m.y. ago
Stratigraphy
Geological group:Yezo Formation:Tenkaritoge
Stratigraphic resolution:bed
Stratigraphy comments: The stratigraphic horizon of the limestone is the Upper Cretaceous (middle Cenomanian) by the presence of Desmoceras japonicum(Yabe, 1904), and Turrilites sp. cfr. T. acutus Passy, 1832 (Tanabe et al., 1977; Kanie et al., 1996; Funaki and Hirano, 2004).
Lithology and environment
Primary lithology: lithified "limestone"
Environment:reef, buildup or bioherm
Geology comments: The subsequent workers (i.e., Kaim et al., 2008; Kiel et al., 2008) called it the Kanajirisawa seep and reported additional mollusks representing a cold seep-dependent chemosynthetic community. Ogihara (2005; 2008) recognized the limestones as cold-seep carbonate rocks based upon biomarker analyses and the significant depletion of δ13C values vs PDB (-43.4- -39.9‰).
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Mikasa City Museum (MCM) and the Mizunami Fossil Museum (MFM).
Metadata
Also known as:Loc. OB42095 of Funaki and Hirano 2004
Database number:276111
Authorizer:M. Clapham Enterer:J. Fearon
Research group:marine invertebrate
Created:2025-12-09 20:08:12 Last modified:2025-12-09 20:08:12
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
93576. H. Karasawa and M. Kano. 2022. A first notice of the goniodromitid crab from the Cenomanian (Upper Cretaceous) cold seep deposits of Hokkaido, Japan, with the redescription of Sabellidromites inflata (Collins and Karasawa, 1993) (Decapoda: Goniodromitidae). Boletín de la Sociedad Geológica Mexicana 73(3) [M. Clapham/J. Fearon]