Heitaro River, B Formation: Middle Campanian - Late Campanian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polycystinea - Nassellaria - Amphipyndacidae
Amphipyndax stocki (Campbell and Clark 1944)
Polycystinea - Nassellaria - Archaeodictyomitridae
Polycystinea - Nassellaria - Theopiliidae
Polycystinea - Nassellaria - Carpocaniidae
Polycystinea - Nassellaria - Eucyrtidiidae
Stichomitra communis Squinabol 1903
Polycystinea - Nassellaria - Acropyramididae
Cornutella californica Campbell and Clark 1944
Polycystinea - Spumellaria - Praeconocaryommidae
Polycystinea - Spumellaria - Phaseliformidae
Phaseliforma cf. laxa Pessagno 1972
Polycystinea - Spumellaria - Spongodiscidae
Polycystinea - Spumellaria
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 45.0° North, 142.3° East (view map)
Paleocoordinates:50.0° North, 140.2° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Campanian 10 m.y. bin: Cretaceous 7
Key time interval: Middle Campanian - Late Campanian
Age range of interval: 83.6 - 72.2 m.y. ago
Stratigraphy
Geological group:Hakobuchi Formation:B
Stratigraphic resolution:group of beds
Stratigraphy comments: 2 samples
Lithology and environment
Primary lithology: lithified siltstone
Secondary lithology: lithified sandstone
Lithology description: dark grey siltstone and sandstone
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:95790
Authorizer:W. Kiessling Enterer:U. Merkel
Research group:micropaleontology
Created:2010-04-28 05:40:29 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-04-28 05:40:29
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]