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Keiseitoge Volcanic Rock Member (Hayakawa et al., 1954) Tuzino et al., 2018
Invalid synonym: Keiseitoge Hyperthene Andesite
- Type locality: Keisei pass, Ichinohe city, Ninohe county, Iwate prefecture
- Coherent formation
- early Miocene (17.4, 16.9 Ma, K-Ar)
- Contemporaneous heterotopic facies: Matsukura Siliciclastic Rock Member
- Intruded by: Basaltic andesite - Andesite
- Sedimentary facies: Terrestrial
- Lithofacies: Basaltic andesite - andesite volcaniclastic rocks
- Lithofacies: Tuff breccia, Lapilli tuff, Tuff, Volcanic conglomerate, Sandstone, Tuffaceous sandstone
- Lithofacies (Minor): Silicified wood
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Keisei pass - Nezori - Omogishi - Tsukushimori, Ichinohe city, Ninohe county, Iwate pref.; Shiratori river, Sakamoto - Tsunagi, Shiratori, Ninohe city, Iwate pref.; Chayaba - Numayama, Narayama, Ichinohe city, Ninohe county, Iwate pref.
- Fossils (Tree trunks): family Fagaceae, family Juglandaceae, family Lauraceae, family Pinaceae, Quercus sp., family Sapindaceae, subfamily Taxodiaceae, family Ulmaceae
- Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)