Hikagenosawa Fm. of Southern Oyubari (Y070151): Early Cenomanian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Desmoceratidae
1-2 specimens
rare
1-2 specimens
rare
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 44.0° North, 143.0° East (view map)
Paleocoordinates:39.7° North, 165.4° East (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Cenomanian 10 m.y. bin: Cretaceous 5
Key time interval: Early Cenomanian
Age range of interval: 100.5 - 93.9 m.y. ago
Stratigraphy
Geological group:Yezo Formation:Hikagenosawa Member:M7
Stratigraphic resolution:member
Stratigraphy comments: syn: Hikagenosawa shale - Approximately 300m below M8
Lithology and environment
Primary lithology:planar lamination lithified mudstone
Secondary lithology: tuff
Includes fossils?Y
Lithology description: M7: laminated mudstone with acidic tuff intercalations
Environment:offshore
Geology comments: Appears to be a deep water facies, but near enough to shore to have tuffs. Collection consist of inoceramids and ammonites, regarded as deep-water faunas.
Taphonomy
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Taxonomic list comments:Biostratigraphic topic of the paper might preclude mention of taxa other than inoceramids and ammonites
Metadata
Database number:70535
Authorizer:A. Miller Enterer:C. Ferguson
Research group:marine invertebrate
Created:2007-03-27 18:21:08 Last modified:2025-02-22 15:12:02
Access level:the public Released:2007-03-27 18:21:07
Creative Commons license:CC0
Reference information

Primary reference:
15357. F. Kawabe. 2000. Cretaceous Stratigraphy in the Oyubari Area, Central Hokkaido, Japan. Bulletin of the National Science Museum. Series C: Geology and Paleontology 26(1-2):9-56 [A. Miller/C. Ferguson]