Toyora, Protogrammoceras nipponicum zone, Locality (7) Sakuraguchidani V. 10d2: Late/Upper Pliensbachian - Early/Lower Toarcian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Ammonoida indet.
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130 individuals | |||||||||
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Cephalopoda
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Belemnoida indet.
Gray 1849
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1 individual | |||||||||
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Cephalopoda
- Phylloceratida
- Phylloceratidae
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Holcophylloceras sp.
Spath 1927
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1 individual | |||||||||
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Cephalopoda
- Ammonitida
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Ammonitina indet.
Hyatt 1889
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5 individuals | |||||||||
| Aptychi (isolated) | ||||||||||
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Cephalopoda
- Ammonitida
- Dactylioceratidae
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Dactylioceras helianthoides
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13 individuals | |||||||||
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Cephalopoda
- Ammonitida
- Hildoceratidae
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Lioceratoides matsumotoi
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1 individual | |||||||||
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Fuciniceras nakayamense
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11 individuals | |||||||||
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Fuciniceras primordium
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2 individuals | |||||||||
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Fuciniceras sp.
Haas 1913
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9 individuals | |||||||||
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Protogrammoceras onoi
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9 individuals | |||||||||
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Protogrammoceras yabei
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1 individual | |||||||||
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Protogrammoceras nipponicum
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5 individuals | |||||||||
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Protogrammoceras sp.
Spath 1913
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3 individuals | |||||||||
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Harpoceras chrysanthemum
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19 individuals | |||||||||
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Harpoceras inouyei
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2 individuals | |||||||||
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Harpoceras okadai
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4 individuals | |||||||||
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Harpoceras sp.
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17 individuals | |||||||||
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Cephalopoda
- Ammonitida
- Lytoceratidae
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Lytoceras informal sp. A
Suess 1865
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1 individual | |||||||||
| sp. A | ||||||||||
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Bivalvia
- Pectinida
- Oxytomidae
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Meleagrinella sp.
Whitfield 1855
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1 individual | |||||||||
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Bivalvia
- Myalinida
- Inoceramidae
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Pseudomytiloides matsumotoi
Hayami 1960
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10 individuals | |||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Yamaguchi |
| Coordinates: | 34.3° North, 131.0° East (view map) | ||
| Paleocoordinates: | 45.7° North, 139.2° East | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Early/Lower Jurassic |
| Key time interval: | Late/Upper Pliensbachian - Early/Lower Toarcian | ||
| Age range of interval: | 192.90000 - 182.90000 m.y. ago |
Stratigraphy
| Geological group: | Toyora | Formation: | Nishinakayama | Member: | Nb |
| Local section: | (7) Sakuraguchidani V. | Local bed: | 10d2 | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Locality belongs to the Protogrammoceras nipponicum zone. 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,sandy "shale" |
| Lithology description: silty-sandy shale with sandstone bands | |
| 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: | 245 individuals |
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 38183 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2004-04-18 01:51:17 | Last modified: | 2004-04-19 11:35:00 |
| Access level: | the public | Released: | 2004-04-18 01:51:17 |
| Creative Commons license: | CC BY |
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] |