Kumaoi Creek: Coniacian - Santonian, Japan
collected by Masatoshi Kera 1996

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Diplomoceratidae
Cephalopoda - Ammonitida - Pachydiscidae
Eupachydiscus sp. Spath 1922
Cephalopoda - Ammonitida - Kossmaticeratidae
Yokoyamaoceras sp. Wright and Matsumoto 1954
Cephalopoda - Ammonitida - Desmoceratidae
Damesites sp. Matsumoto 1942
Damesites damesi (Jimbo 1894)
Cephalopoda - Ammonitida - Tetragonitidae
Gaudryceras sp. de Grossouvre 1894
Tetragonites sp. (Kossmat 1895)
Bivalvia - Myalinida - Inoceramidae
Platyceramus sp. Heinz 1932
unclassified
Osteichthyes - Hesperornithiformes
MCM.A773 - holotype
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 43.3° North, 142.1° East (view map)
Paleocoordinates:51.4° North, 138.6° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Coniacian - Santonian 10 m.y. bin: Cretaceous 6
Key time interval: Coniacian - Santonian
Age range of interval: 89.8 - 83.6 m.y. ago
Stratigraphy
Geological group:Yezo Formation:Kashima
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:bioturbation siltstone
Secondary lithology:planar lamination,fine,tuffaceous,gray,white sandstone
Includes fossils?Y
Includes fossils?Y
Lithology description: bioturbated siltstones with intercalated parallel-laminated fine sandstones and greyish white tuffaceous sandstones
Environment:coastal indet.
Geology comments: outer shelf to continental slope depositional environments
Taphonomy
Modes of preservation:body,concretion
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collectors:Masatoshi Kera Collection dates:1996
Metadata
Also known as:Lake Katsurazawa; Mikasa City
Database number:193939
Authorizer:P. Mannion Enterer:P. Mannion
Modifier:M. Carrano Research group:vertebrate
Created:2018-06-07 11:49:08 Last modified:2025-03-07 14:08:40
Access level:the public Released:2018-06-07 11:49:08
Creative Commons license:CC0
Reference information

Primary reference:
65856. T. Tanaka, Y. Kobayashi, K. Kurihara, A. R. Fiorillo, and M. Kano. 2018. The oldest Asian hesperornithiform from the Upper Cretaceous of Japan, and the phylogenetic reassessment of Hesperornithiformes. Journal of Systematic Palaeontology 16(8):689-709 [P. Mannion/P. Mannion]