Suribachi-zawa River, Horonakai area: Early Cenomanian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Octopoda
Ikegami et al. 2026 1 specimen
Cephalopoda - Ammonitida - Tetragonitidae
(12 measurements)
see common names

Geography
Country:Japan
Coordinates: 44.2° North, 142.1° East (view map)
Paleocoordinates:50.5° 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: Early Cenomanian
Age range of interval: 100.5 - 93.9 m.y. ago
Stratigraphy
Geological group:Yezo
Stratigraphic resolution:group of beds
Stratigraphy comments: My3 Unit (Graysonites wooldridge Zone and Stoliczkaia japonica Assemblage Zone)
Lithology and environment
Primary lithology:concretionary lithified "siliciclastic"
Environment:marine indet.
Taphonomy
Modes of preservation:body,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: National Museum of Nature and Science, Tsukuba (NMNS)
Metadata
Database number:229682
Authorizer:M. Clapham, M. Uhen Enterer:M. Clapham, M. Uhen
Research group:marine invertebrate
Created:2023-03-21 23:07:00 Last modified:2025-02-22 15:12:02
Access level:the public Released:2023-03-21 23:07:00
Creative Commons license:CC0
Reference information

Primary reference:
84170. Y. Shigeta, H. Maeda, and T. Sakai. 2023. Dimorphism in the Early Cenomanian (Late Cretaceous) ammonoid Parajaubertella. Paleontological Research 27:396-416 [M. Clapham/M. Clapham]

Secondary references:

94699 S. Ikegami, J. Mutterlose, K. Sugiura, Y. Takeda, M. O. Derin, A. Kubota, K. Tainaka, T. Harada, H. Nishida and Y. Iba. 2026. Earliest octopuses were giant top predators in Cretaceous oceans. Science 392(6796):406-410 [M. Uhen/M. Uhen]