Central Shikoku (32602R): Tithonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Polycystinea - Nassellaria - Eucyrtidiellidae
Eucyrtidiellum ptyctum (Riedel and Sanfilippo 1974)
Polycystinea - Nassellaria - Pseudodictyomitridae
Loopus primitivus (Matsuoka and Yao 1985)
Polycystinea - Nassellaria - Parvicingulidae
Ristola altissima (Rüst 1885)
see common names

Geography
Country:Japan
Coordinates: 33.7° North, 133.8° East (view map)
Paleocoordinates:52.8° North, 142.2° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Jurassic Epoch: Late Jurassic
Stage: Tithonian 10 m.y. bin: Jurassic 6
Key time interval: Tithonian Other zone:  Loopus primitivus
Age range of interval: 149.2 - 143.1 m.y. ago
Stratigraphy
Formation:Birafu Member:A3
Local order:bottom to top
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: lithified tuff
Secondary lithology: lithified mudstone
Lithology description: Member A3 is characterized by sandy mudstone and mudstone. The upper part of the member is again intercalated with tuff and the mudstone yields rare bivalves and Tithonian radiolarians (32602R). This unit is approximately 40 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:116554
Authorizer:M. Aberhan Enterer:D. Wellmanns
Modifier:D. Wellmanns Research group:marine invertebrate
Created:2011-09-09 00:30:09 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2016-09-09 00:30:09
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]