Tochikubo 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 |
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]
Fossil content
[edit]Color key
|
Notes Uncertain or tentative taxa are in small text; |
Plants
[edit]| 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 | ||
See also
[edit]
Footnotes
[edit]- ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- ↑ Pott, Christian; Takimoto, Hideo (2022-04-01). "Kimuriella gen. nov. (Bennettitales), a Whole-Plant Bennettite from the Oxfordian (Upper Jurassic) Tochikubo Formation of Shidazawa, Minamisōma, Fukushima Prefecture, Northeast Japan". Paleontological Research. 26 (2). doi:10.2517/PR200020. ISSN 1342-8144.
- ↑ Pott, C.; Takimoto, H. (2025). "Ohaniella gen. nov., a new whole-plant bennettite from the Oxfordian (Upper Jurassic) Tochikubo Formation of Shidazawa, Fukushima, northeast Japan". Paleontological Research. 29 (1): 316–331. doi:10.2517/prpsj.250010.
- ↑ Hideo Takimoto; Tamiko Ohana (2016). "Encephalartites nipponensis sp. nov., from the Jurassic Tochikubo Formation (Oxfordian), Somanakamura Group, Northeast Japan". Paleontological Research. 20 (3): 261–267. Bibcode:2016PalRe..20..261T. doi:10.2517/2015PR035. S2CID 132529889.
References
[edit]- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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