Kaizawa Valley: Smithian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ceratitida
- Aspenitidae
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Aspenites sp.
Hyatt and Smith 1905
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Cephalopoda
- Ceratitida
- Paranannitidae
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Owenites shimizui
(Sakagami 1955)
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| synonym of Owenites koeneni | ||||||||||
| (1 measurement) | ||||||||||
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Cephalopoda
- Ceratitida
- Meekoceratidae
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Juvenites sp.
Smith 1927
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= Juvenites sinuosus
Kiparisova 1947
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Shigeta and Nguyen 2014 | |||||||||
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Cephalopoda
- Ceratitida
- Dieneroceratidae
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Dieneroceras sp.
Spath 1934
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Dieneroceras iwaiense
(Sakagami 1955)
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| synonym of Dieneroceras dieneri | ||||||||||
| (9 measurements) | ||||||||||
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Cephalopoda
- Ceratitida
- Melagathiceratidae
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Paranannites sp.
Hyatt and Smith 1905
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| (1 measurement) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Tokyo-to | County: | Nishitama-gun |
| Coordinates: | 35.0° North, 139.0° East (view map) | ||||
| Paleocoordinates: | 35.0° North, 115.6° East | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | local area |
Time
| Period: | Triassic | Epoch: | Early/Lower Triassic |
| Stage: | Olenekian | 10 m.y. bin: | Triassic 1 |
| Key time interval: | Smithian | ||
| Age range of interval: | 251.20000 - 248.90000 m.y. ago |
Stratigraphy
| Formation: | Iwai | Local bed: | d | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: The ammonoids are listed as Meekoceras Zone (=Smithian) | |||||
Lithology and environment
| Primary lithology: | lenticular,black "shale" |
| Includes fossils? | Y |
| Lithology description: black shale. Lowe fossil bed occurs about 2m above base of the upper member (unit d) , where the fossils occur in lenses of black limestone. The upper fossil bed is 17m above the lower fossil bed and consists of marl lenses. | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | MCZ |
| Collection method comments: Some specimens are held at Tokyo University of Education | |
Metadata
| Database number: | 44043 | ||
| Authorizer: | A. McGowan, M. Clapham | Enterer: | A. McGowan, M. Clapham |
| Modifier: | A. McGowan | Research group: | marine invertebrate |
| Created: | 2004-08-31 09:07:30 | Last modified: | 2005-02-17 04:18:34 |
| Access level: | the public | Released: | 2004-08-31 09:07:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 11561. | B. Kummel and S. Sakagami. 1960. Mid-Scythian Ammonites from Iwai Formation, Japan. Breviora 126:1-11 [A. McGowan/A. McGowan/A. McGowan] |
Secondary references:
| 50776 | Y. Shigeta and H. D. Nguyen. 2014. Cephalopods. In Y. Shigeta, T. Komatsu, T. Maekawa, H. T. Dang (eds.), Olenekian (Early Triassic) stratigraphy and fossil assemblages in northeastern Vietnam. National Museum of Nature and Science Monographs 45:65-167 [M. Clapham/M. Clapham] |