Higashi-Tanakura Group Kubota Fm Molluscan Fauna Locality 21: Late/Upper Miocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Scaphopoda - Dentaliida - Dentaliidae
Dentalium yokoyamai
Gastropoda - Turritellidae
Turritella tanaguraensis
Gastropoda - Naticidae
Neverita kiritaniana (Yokoyama 1931)
synonym of Glossaulax didyma
Gastropoda - Neogastropoda - Buccinidae
Neptunea hukusimensis
Phos iwakianus
Gastropoda - Ranellidae
Charonia cf. sauliae (Reeve 1844)
Bivalvia - Mytilida - Mytilidae
Mytilus grayanus Dunker 1853
recombined as Crenomytilus grayanus
Bivalvia - Pectinida - Pectinidae
Chlamys kaneharai (Yokoyama 1926)
recombined as Mimachlamys kaneharai
Bivalvia - Arcida - Arcidae
Barbatia obtusoides
Anadara ninohensis
Dominant species at locality
Bivalvia - Arcida - Glycymerididae
Glycymeris yessoensis
Bivalvia - Cardiida - Veneridae
Protothaca tateiwai
synonym of Leukoma
Dosinia kaneharai
Dosinia japonica
Mercenaria chitaniana
Bivalvia - Lucinida - Lucinidae
Lucinoma annulata (Reeve 1850)
recombined as Lucinoma annulatum
see common names

Geography
Country:Japan
Coordinates: 37.5° North, 140.0° East (view map)
Paleocoordinates:38.9° North, 138.4° East
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 6
Key time interval:Late/Upper Miocene
Age range of interval:11.63000 - 5.33300 m.y. ago
Stratigraphy
Geological group:Higashi-Tanakura Formation:Kubota
Stratigraphic resolution:formation
Stratigraphy comments: Higbashi-Tanajura group is a marine representative of the regressive Genjigawa stage

Middle part of Kubota formation
Lithology and environment
Primary lithology:medium,micaceous,gray,blue lithified argillaceous sandstone
Secondary lithology:fine,micaceous,black,blue lithified argillaceous sandstone
Includes fossils?Y
Includes fossils?Y
Lithology description: massive medium sandstone in the lower part and massive fine sandstone with intercalations of several ash tuff layers in the central and upper part of the basin...characterized by abundant occurrence of molluscan fossils. Bluish-gray medium to fine sandstone covers (beds below) and consists mainly of quartz and mica grains with argillaceous materials. It is fine in the west, and becomes coarser eastward...The medium sandstone is covered by massive fine sandstone in the southern area. This fine sandstone is bluish-black colored, massive, homogeneous, argillaceous and rich in mica flakes. Several white fine ash tuff layers are intercalated in the middle part of the fine sandstone. They are concentrated in three restricted horizons. Coarse sandstone lenses, rich in shell fragments and quartz grains are found at Okada. They are more than 10m in thickness and are contemporaneous with the fine sandstone and diminish laterally into the fine sandstone.
Environment:marginal marine indet.
Geology comments: Lateral and vertical changes of lithofacies indicate that the group had been accumulated in the course of a local transgression and regression. Sediment is supplied from Abukuma mountain block. Paleogeographically, Higashi-Tanakura group is the deposits filling up a small shallow embayment open to the north.
Taphonomy
Modes of preservation:body
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Also known as:Locality 21
Database number:52124
Authorizer:A. Miller Enterer:K. Bulinski
Modifier:K. Bulinski Research group:marine invertebrate
Created:2005-07-25 14:17:44 Last modified:2005-08-01 12:15:17
Access level:the public Released:2005-07-25 14:17:44
Creative Commons license:CC BY
Reference information

Primary reference:

13978. Y. Iwasaki. 1970. The Shiobara-type Molluscan Fauna: An ecological analysis of fossil molluscs. Journal of the faculty of science, University of Tokyo, Section 2 17(3):351-444 [A. Miller/K. Bulinski/K. Bulinski]