Utsunai River, E Formation: Late Maastrichtian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polycystinea - Nassellaria - Eucyrtidiidae
Polycystinea - Nassellaria - Acropyramididae
Polycystinea - Nassellaria - Amphipyndacidae
Amphipyndax stocki (Campbell and Clark 1944)
Polycystinea - Nassellaria - Archaeodictyomitridae
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 45.0° North, 142.2° East (view map)
Paleocoordinates:49.5° North, 132.8° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Maastrichtian 10 m.y. bin: Cretaceous 8
Key time interval: Late Maastrichtian
Age range of interval: 72.2 - 66 m.y. ago
Stratigraphy
Geological group:Hakobuchi Formation:E
Stratigraphic resolution:group of beds
Stratigraphy comments: 2 samples
Lithology and environment
Primary lithology: lithified siltstone
Secondary lithology: lithified sandstone
Lithology description: glauconitic sandstone and intercalated thin beds of sandy siltstone and green mudstone
Environment:basinal (siliciclastic)
Taphonomy
Modes of preservation:body
Size of fossils:microfossils
Preservation of anatomical detail:good
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:95793
Authorizer:W. Kiessling Enterer:U. Merkel
Research group:micropaleontology
Created:2010-04-28 05:53:15 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-04-28 05:53:15
Creative Commons license:CC0
Reference information

Primary reference:
32537. K. Iwata, Y. Watanabe, and J. Tajika. 1992. Radiolarian biostratigraphic study of the Hakobuchi Group in the Nakatonbetsu area, north Hokkaido. Report of the Geological Survey of Hokkaido 63:1-21 [W. Kiessling/U. Merkel]