Toyora, Fontanelliceras fontanellense zone, Locality (7) Sakuraguchidani V. 10a: Tenuicostatum, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Lytoceratidae
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| 1 individual | ||||||||||
| sp. A | ||||||||||
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Cephalopoda
- Ammonitida
- Hildoceratidae
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Fontanelliceras fontanellense
(Gemmellaro 1885)
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4 individuals | |||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Yamaguchi |
| Coordinates: | 34.3° North, 131.0° East (view map) | ||
| Paleocoordinates: | 45.2° North, 155.7° East (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Early Jurassic |
| Stage: | Toarcian | 10 m.y. bin: | Jurassic 3 |
| Key time interval: | Tenuicostatum | ||
| Age range of interval: | 184.2 - 182.9 m.y. ago |
Stratigraphy
| Geological group: | Toyora | Formation: | Nishinakayama | Member: | Nb |
| Local section: | (7) Sakuraguchidani V. | Local bed: | 10a´ | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Locality belongs to the Fontanelliceras fontanellense zone = lowermost Toarcian according to revisions of Nakada and Matsuoka (2008, 2011).
The Nishinakayama Fm attains about 300m in maximum thickness, and is lithostratigraphically subdivided into three members, namely Na, Nb (black shales with intercalations of fine sandstone; 160m thick), and Nc in upward sequence. | |||||
Lithology and environment
| Primary lithology: | silty "shale" |
| Environment: | marine indet. |
| Geology comments: Lower to Middle Jurassic shallow marine (partly brackish?) clastic deposits | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Collection size: | 5 individuals |
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 38171 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2004-04-17 11:50:00 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2004-04-17 11:50:00 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 10253. | K. Tanabe. 1991. Early Jurrasic Macrofauna of the Oxygen-Depleted Epicontinental Marin Basin in the Toyora Area, West Japan. Saito Ho-on Kai Special Publication 3:147-161 [M. Aberhan/S. Nurnberg/P. Wagner] |