Central Shikoku (32607R): Berriasian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polycystinea - Nassellaria - Canoptidae
Cinguloturris cylindra Kemkin and Rudenko 1993
Polycystinea - Nassellaria - Parvicingulidae
Ristola aff. cretacea (Baumgartner 1980)
Polycystinea - Nassellaria - Eucyrtidiellidae
Polycystinea - Nassellaria - Archaeodictyomitridae
see common names

Geography
Country:Japan
Coordinates: 33.7° North, 133.8° East (view map)
Paleocoordinates:49.6° North, 140.0° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous
Stage: Berriasian 10 m.y. bin: Cretaceous 1
Key time interval: Berriasian Other zone:  Pseudodictyomitra carpatica
Age range of interval: 143.1 - 137.05 m.y. ago
Stratigraphy
Formation:Birafu Member:C
Local order:bottom to top
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: lithified mudstone
Lithology description: Member C is composed of sandstone, mudstone, tuff and alternating beds of sandstone and mudstone. The sandstone is medium-grained, graded and ranging from 1 cm to 10 cm in thickness. Parallel and current ripple laminations are observed. The mudstone yielded radiolarians (32606R, 32607R, 32608R, 32609R). This unit is approximately 280 m thick
Environment:slope
Taphonomy
Modes of preservation:body
Size of fossils:mesofossils,microfossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:116557
Authorizer:M. Aberhan Enterer:D. Wellmanns
Research group:marine invertebrate
Created:2011-09-09 00:42:21 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2016-09-09 00:42:21
Creative Commons license:CC0
Reference information

Primary reference:
37488. T. Kozai, K. Ishida, and Y. Kondo. 2006. Radiolarians, bivalves and the J/K boundary in the Birafu Formation, southern Kurosegawa Belt, Central Shikoku, SW Japan. Geosciences Journal 10(3):217-235 [M. Aberhan/D. Wellmanns]