Fourth formation (W4, KD-34): Neocomian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Actinopteri - Ellimmichthyiformes
Diplomystus sp. Cope 1877
KMNH VP 100,211-216, 234
Diplomystus altisomus Yabumoto 1994
holotype: KMNH VP 100,217; 218-221
Actinopteri - Osteoglossiformes - Wakinoichthiidae
Wakinoichthys aokii Yabumoto 1994
Specimen numbers the same as in collection 145246
see common names

Geography
Country:Japan State/province:Fukuoka
Coordinates: 33.8° North, 130.9° East (view map)
Paleocoordinates:41.1° North, 132.6° East
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Key time interval:Neocomian
Age range of interval:145.00000 - 130.00000 m.y. ago
Stratigraphy
Geological group:Wakino Formation:Third
Stratigraphy comments: The fourth formation (the uppermost formation, W4) correlates to the Upper Wakamiya Formation. The thickness is around 250m. The basal part consists of a conglomerate of white chert and unconformably or conformably overlies the third formation.
Lithology and environment
Primary lithology: lithified sandstone
Secondary lithology: lithified "shale"
Includes fossils?Y
Includes fossils?Y
Lithology description: The fourth formation is composed chiefly of sandstone and siliceous shale, with shale, tuff, conglomerate and reddish purple sandstone.
Environment:terrestrial indet.
Taphonomy
Modes of preservation:adpression
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some genera
Collection methods:chemical,peel or thin section
Reason for describing collection:taxonomic analysis
Collection method comments: All fossil specimens used in the present study are deposited in the Kitakyushu Museum and Institute of Natural History (NMNH)

Some specimens were immersed in a bath of 20% HCl and 80% water in 24-48 hours to etch their bones. Latex peels were made from the etched fossils for observation.

The outline of large specimens were drawn by tracing the enlarged positive films and detailed drawings were made with a binocular microscope.
Metadata
Database number:145246
Authorizer:M. Bell Enterer:M. Bell
Modifier:M. Bell
Created:2013-05-30 21:31:52 Last modified:2013-05-30 07:36:40
Access level:the public Released:2013-05-30 21:31:52
Creative Commons license:CC BY
Reference information

Primary reference:

46901. Y. Yabumoto. 1994. Early Cretaceous freshwater fish fauna in Kyushu, Japan. Bulletin of the Kitakyushu Museum of Natural History 13:107-254 [M. Bell/M. Bell]