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Tochu Formation
- Lithofacies: Slate, Limestone
- Lithofacies (Minor): Calcareous conglomerate, Sandstone
- Lithofacies (Basal): Conglomerate
- Thickness: 900 m
- Thickness (Basal conglomerate): ca. 30 m
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Esashiyonesato, Oshu city, Iwate pref.; Nagano, Otomo town, Tono city, Iwate pref.
- Fossils: Calcreous algae (Algae gen. et sp. indet), Fusulinids (Pseudofusulina vulgaris, Pseudoschwagerina sp.)
- Fossils (Limestone): Crinoids, Bryozoans, Fusulinids (Schwagerina sp.), Corals (Wentzelella timorica)
- Hirokawa and Yoshida (1954) Hitokabe, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 33p. (in Japanese with English abstract 14p.)