Hidakagawa River, loc. 1 and 2: Late Campanian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polycystinea - Spumellaria - Patulibracchiidae
Patulibracchium sp. (Pessagno 1971)
Polycystinea - Spumellaria - Pseudoaulophacidae
Pseudoaulophacus sp. Pessagno 1963
Alievium sp. Pessagno 1972
Polycystinea - Nassellaria - Lithocampida
Polycystinea - Nassellaria - Amphipyndacidae
Amphipyndax stocki (Campbell and Clark 1944)
Polycystinea - Nassellaria - Archaeodictyomitridae
Dictyomitra sp. Zittel 1876
Dictyomitra formosa Squinabol 1904
Polycystinea - Nassellaria - Xitidae
see common names

Geography
Country:Japan State/province:Wakayama
Coordinates: 33.9° North, 135.2° East (view map)
Paleocoordinates:40.6° North, 129.3° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Campanian 10 m.y. bin: Cretaceous 7
Key time interval: Late Campanian
Age range of interval: 83.6 - 72.2 m.y. ago
Stratigraphy
Formation:Ryujin Member:Disrupted Sandstone and Shale
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology: lithified mudstone
Secondary lithology: lithified sandstone
Includes fossils?Y
Lithology description: mudstone-dominant alternating beds of mudstones and sandstones
Environment:basinal (siliceous)
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:taxonomic analysis
Metadata
Database number:95764
Authorizer:W. Kiessling Enterer:U. Merkel
Research group:micropaleontology
Created:2010-04-27 05:23:56 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-04-27 05:23:55
Creative Commons license:CC0
Reference information

Primary reference:
32529. T. Tokiwa, Y. Mori, and H. Suzuki. 2005. Cretaceous radiolarian fossils from the Ryujin Formation of the Shimanto Belt in the Kawabe area, Wakayama Prefecture, southwest Japan. Journal of Earth and Planetary Sciences 52:11-23 [W. Kiessling/U. Merkel]