Gohara, Annaka City: Langhian, Japan
collected by Yoshitaka Takayama

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Hexanchiformes - Chlamydoselachidae
1 specimen
GMNH-PV-576 (Chlamydoselachus sp. in Takakuwa et al., 2001)
see common names

Geography
Country:Japan
Coordinates: 36.3° North, 138.8° East (view map)
Paleocoordinates:36.1° North, 136.3° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Miocene
Stage: Langhian 10 m.y. bin: Cenozoic 5
Key time interval: Langhian
Age range of interval: 15.98 - 13.82 m.y. ago
Stratigraphy
Formation:Haratajino
Stratigraphic resolution:group of beds
Stratigraphy comments: Early Middle Miocene in Goto &TJFSTR (2004). Takashi & Hayashi (2004) reviewed the stratigraphy in the Tomioka area, assigning the entire Tomioka Group (including the Haratajino Formation, the uppermost unit) to the early Middle Miocene (between 16.4 Ma and 16.0 Ma). The Haratajino Formation has a tuff bed at its base dated as 15.2 +/- 0.5 Ma by fission-track, and contains the first appearance of Praeorbulina circularis around 16.0 Ma.
Lithology and environment
Primary lithology: sandy siltstone
Environment:basinal (siliciclastic)
Geology comments: Subabyssal zone
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collectors:Yoshitaka Takayama
Collection method comments: Repository: Gunma Museum of Natural History (GMNH)
Metadata
Database number:278455
Authorizer:M. Clapham Enterer:M. Clapham
Research group:vertebrate
Created:2026-03-23 19:07:58 Last modified:2026-03-23 19:07:58
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
94394. M. Goto and The Japanese Club for Fossil Shark Tooth Research. 2004. Tooth remains of chlamydoselachian sharks from Japan and their phylogeny and paleoecology. Earth Science (Chikyu Kagaku) 58:361-374 [M. Clapham/M. Clapham]