West of Namiita, Zyugohama-mura, Monoo-gun, Miyagi Prefecture: Spathian, Japan
collected by N. Takahashi

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Scyphozoa - Conulariida - Conulariopsidae
see common names

Geography
Country:Japan
Coordinates: 38.5° North, 141.5° East (view map)
Paleocoordinates:4.6° North, 138.6° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Triassic Epoch: Early Triassic
Stage: Olenekian 10 m.y. bin: Triassic 1
Key time interval: Spathian
Age range of interval: 248.6 - 247 m.y. ago
Stratigraphy
Formation:Hiraiso
Stratigraphic resolution:group of beds
Stratigraphy comments: "Onagawa slate" with "Ophiceras"-like ammonoids. Bando (1970) originally assigned the Hiraiso Fm. to the Griesbachian, later it was assigned to the Smithian by Nakazawa et al. (1994). Reidentification of Bando's ammonite as Neocolumbites and discovery of Tirolites in the lower part of the formation suggests a Spathian age for the Hiraiso Formation (Shigeta & Nakajima, 2017).
Lithology and environment
Primary lithology: lithified "shale"
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collectors:N. Takahashi
Metadata
Database number:132574
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2012-08-22 13:53:42 Last modified:2025-02-22 15:12:02
Access level:the public Released:2012-08-22 13:53:42
Creative Commons license:CC0
Reference information

Primary reference:
42884. T. Sugiyama. 1942. Studies on the Japanese Conularida. Journal of the Geological Society of Japan 49(589):185-194 [M. Clapham/M. Clapham]