Abeshinai River, locality 2: Santonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Lamniformes
17 specimens
NMV 95, 114, 115, 117, 118, 121-129, 136-138
Chondrichthyes - Lamniformes - Otodontidae
6 specimens
NMV 94, 110, 112, 113, 133, 135
1 specimen
NMV 111
1 specimen
NMV 134
Chondrichthyes - Echinorhiniformes - Echinorhinidae
Echinorhinus sp. Blainville 1816
1 specimen
NMV 97
Chondrichthyes - Hexanchiformes
2 specimens
NMV 90, 99
Chondrichthyes - Hexanchiformes - Hexanchidae
1 specimen
NMV 105
Hexanchus sp. Rafinesque 1810
3 specimens
NMV 101, 102, 104
Xampylodon dentatus (Woodward 1886)
1 specimen
NMV 96
Chondrichthyes
3 specimens
NMV 88, 89, 91
4 specimens
NMV 86, 87, 92, 93
2 specimens
NMV 130, 131
see common names

Geography
Country:Japan
Coordinates: 44.6° North, 142.1° East (view map)
Paleocoordinates:52.7° North, 130.7° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Santonian 10 m.y. bin: Cretaceous 6
Key time interval: Santonian
Age range of interval: 85.7 - 83.6 m.y. ago
Stratigraphy
Formation:Nishichirashinai
Stratigraphic resolution:bed
Stratigraphy comments: Based on the occurrence of the ammonoids Anagaudryceras cf. yamashitai, Gaudryceras tenuiliratum, Yokoyamaoceras ishikawai, Menuites sp., Eupachydiscus cf. haradai, Protexanites? sp. and Polyptychoceras sp. and the inoceramid Sphenoceramus naumanni, this conglomerate is correlated with the Santonian to lower Campanian. Meanwhile, Takahashi et al. (2007) considered that the base of Campanian in the Nakagawa area is indicated by the lowermost occurrence of the bivalve Inoceramus (Platyceramus) japonicus in the upper part of the Omagari Formation, whose stratigraphic level is 500 m or more above the Abeshinai locality. Therefore, strata of this locality are referred to the Santonian.
Lithology and environment
Primary lithology: lithified conglomeratic siltstone
Lithology description: Large lens of poorly sorted conglomerate embedded in dark siltstone.
Environment:submarine fan
Geology comments: Allochthonous material accumulated in submarine channel-fill sediment
Taphonomy
Modes of preservation:body,shellbed
Size of fossils:mesofossils
Spatial resolution:allochthonous
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Nakagawa Museum of Natural History, Japan (NMV)
Metadata
Database number:228160
Authorizer:M. Uhen, M. Clapham Enterer:A. Westbank, M. Clapham
Modifier:M. Clapham Research group:vertebrate
Created:2022-11-21 14:32:04 Last modified:2025-02-22 15:12:02
Access level:the public Released:2022-11-21 14:32:04
Creative Commons license:CC0
Reference information

Primary reference:
83164. S. Kanno, S. Tokumaru, S. Nakagaki, Y. Nakajima, A. Misaki, Y. Hikida, and T. Sato. 2022. Santonian-Campanian neoselachian faunas of the Upper Cretaceous Yezo Group in Nakagawa Town, Hokkaido, Japan. Cretaceous Research 133:105-139 [M. Uhen/A. Westbank]

Secondary references:

94277 S. Kanno, Y. Nakajima, Y. Hikida and T. Sato. 2017. Sphenodus (Chondrichthyes, Neoselachii) from the Upper Cretaceous in Nakagawa Town, Hokkaido, Japan. Paleontological Research 21:122-130 [M. Clapham/M. Clapham]