Tochikubo Formation
Geologic formation in Japan
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The Tochikubo Formation is a Jurassic geologic formation in northern Honshu, Japan, dating to the Oxfordian stage of the Late Jurassic. Fossil ornithopod tracks have been reported from the formation.[1] As well as the bennettitaleans Kimuriella[2] and Ohaniella.[3]
Unit ofSomanakamura Group
UnderliesNakanosawa Formation
OverliesYamagami Formation
| Tochikubo Formation | |
|---|---|
| Stratigraphic range: Late Jurassic | |
| Type | Geological formation |
| Unit of | Somanakamura Group |
| Underlies | Nakanosawa Formation |
| Overlies | Yamagami Formation |
| Area | Japan |
| Thickness | Up to 350 m |
| Lithology | |
| Primary | Sandstone, Shale |
| Location | |
| Region | Fukushima Prefecture |
| Country | Japan |
| Extent | Abukuma Highlands, eastern Honshu |
Fossil conent
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Plants
| Plants of the Tochikubo Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Image |
| Kimuriella | K. densifolia | Fukushima | Oxfordian | A williamsoniacean bennettitalean | ||
| Encephalartites[4] | E. nipponensis | Fukushima | Oxforian | A cycad | ||
| Nilssoniocladus | N. japonicus | Fukushima | Oxfordian | A nilssoniacean cyclad | ||
| N. tairae | ||||||
| Ohaniella | O. ptilofolia | Fukushima | Oxfordian | A williamsoniacean bennettitalean | ||
