Member B, Soya area: Early Campanian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Myalinida - Inoceramidae
Sphenoceramus elegans (Sokolow 1914)
Cephalopoda - Ammonitida - Pachydiscidae
see common names

Geography
Country:Japan County:Hokkaido
Coordinates: 45.5° North, 141.9° East (view map)
Paleocoordinates:53.4° North, 129.5° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Campanian 10 m.y. bin: Cretaceous 7
Key time interval: Early Campanian
Age range of interval: 83.6 - 72.2 m.y. ago
Stratigraphy
Formation:Ohimisaki
Stratigraphic resolution:member
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From "Member B" of the Ohimisaki Fm, which is overlain by the Orannai Fm. AGE: Early Campanian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From near base of regional section.
Lithology and environment
Primary lithology:nodular lithified calcareous mudstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Mudstone containing calcareous nodules. LITHIFICATION: Lithified, on the basis of figured specimens.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Not stated in text, but presumably a shallow siliciclastic setting.
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some genera,some macrofossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collection method comments: COLLECTOR: Not stated, but presumably the authors T. Matsumoto and T. Miyauchi. REPOSITORY: Dept. of Geology, Kyushu University, Japan.
Taxonomic list comments:COVERAGE: Limited to characteristics ammonites described in text. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications.
Metadata
Also known as:Loc. W4A
Database number:87035
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2009-03-01 20:11:50 Last modified:2025-02-22 15:12:02
Access level:the public Released:2009-03-01 20:11:50
Creative Commons license:CC0
Reference information

Primary reference:
29280. T. Matsumoto. 1984. Part I. Ammonites from the Upper Campanian of the Teshio Mountains. Palaeontological Society of Japan Special Papers 27:5-32 [A. Hendy/A. Hendy/A. Hendy]