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Mataki Formation
- Lithofacies: Conglomerate, Sandstone
- Lithofacies (Minor): Tuff, Siltstone
- Sedimentary structures: Trough cross-stratification, Imbricate structure
- Paleocurrent: East to West
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nishifukakaya, Fujisawa town, Ichinoseki city, Iwate pref.; Idozawa, Hanaizumi town, Ichinoseki city, Iwate pref.; Nasuzawa, Ichinoseki city, Iwate pref.; Izumidate, Kawasaki town, Ichinoseki city, Iwate pref.; Matsubara - Kitachoja, Senmaya town, Ichinoseki city, Iwate pref.; Dai - Shibajuku - Numata - Arayashiki, Higashiyama town, Ichinoseki city, Iwate pref.
- Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)
- Takeuchi and Kaneko (1996) Geology of the Shizugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)