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
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Dentalium yokoyamai
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Gastropoda
- Turritellidae
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Turritella tanaguraensis
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Gastropoda
- Naticidae
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Neverita kiritaniana
(Yokoyama 1931)
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synonym of Glossaulax didyma | ||||||||||
Gastropoda
- Neogastropoda
- Buccinidae
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Neptunea hukusimensis
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Phos iwakianus
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Gastropoda
- Ranellidae
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Charonia cf. sauliae
(Reeve 1844)
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Bivalvia
- Mytilida
- Mytilidae
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Mytilus grayanus
Dunker 1853
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recombined as Crenomytilus grayanus | ||||||||||
Bivalvia
- Pectinida
- Pectinidae
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Chlamys kaneharai
(Yokoyama 1926)
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recombined as Mimachlamys kaneharai | ||||||||||
Bivalvia
- Arcida
- Arcidae
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Barbatia obtusoides
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Anadara ninohensis
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Dominant species at locality | ||||||||||
Bivalvia
- Arcida
- Glycymerididae
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Glycymeris yessoensis
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Bivalvia
- Cardiida
- Veneridae
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Protothaca tateiwai
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synonym of Leukoma | ||||||||||
Dosinia kaneharai
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Dosinia japonica
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Mercenaria chitaniana
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Bivalvia
- Lucinida
- Lucinidae
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Lucinoma annulata
(Reeve 1850)
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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] |