Tochikubo Formation

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 conent

Color key

Taxon	Reclassified taxon	Taxon falsely reported as present	Dubious taxon or junior synonym	Ichnotaxon	Ootaxon	Morphotaxon

Notes
Uncertain or tentative taxa are in small text; ~~crossed out~~ taxa are discredited.

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
Nilssoniocladus	N. tairae	Fukushima	Oxfordian		A nilssoniacean cyclad
Ohaniella	O. ptilofolia	Fukushima	Oxfordian		A williamsoniacean bennettitalean

↑ 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.

Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.