Ichinotani Valley, Fukuji Area, Gifu Prefecture: Roadian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Pseudorthocerida - Orthoceratoidea
see common names

Geography
Country:Japan
Coordinates: 36.2° North, 137.5° East (view map)
Paleocoordinates:9.1° North, 134.4° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period: Permian Epoch: Guadalupian
Stage: Roadian 10 m.y. bin: Permian 3
Key time interval: Roadian
Age range of interval: 274.4 - 266.9 m.y. ago
Stratigraphy
Formation:Mizuyagadani
Stratigraphic resolution:bed
Stratigraphy comments: The vicinity of the collecting site is underlain by the Mizuyagadani Formation (Igo, 1956), which consists mostly of clastic sediments and has a "lenticular" limestone in its upper part. Although the precise age of the limestone is a pending question, we found the index fusulinid Parafusulina ct. kaerimizensis (Figure 1), associated with the pseudorthoceratid cephalopod Dolorthoceras nakazawai sp. nov., from the same locality and in limestone of similar lithology (but from another float block).
Lithology and environment
Primary lithology:shelly/skeletal lithified wackestone
Lithology description: The cephalopod-bearing limestone consists of bioclastic wackestone and has a characteristic appearance that is dark gray micrite, with sporadic crinoid fragments as the main allochemical constituent, and is identical in lithology with the "lenticular" limestone noted above.
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:116013
Authorizer:M. Clapham Enterer:M. Clapham
Research group:marine invertebrate
Created:2011-09-05 02:47:45 Last modified:2025-02-22 15:12:02
Access level:the public Released:2011-09-05 02:47:45
Creative Commons license:CC0
Reference information

Primary reference:
33636. S. Niko and T. Nishida. 2000. A new pseudorthoceratid cephalopod from the Kazanian (middle Late Permian) of Japan. Paleontological Research 4:53-55 [M. Clapham/M. Clapham]