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Arakawa Pyroclastic Rocks Kitamura, 1979

• Type locality: Arakawa river, Shikama city, Kami county, Miyagi prefecture
• Volcanic rocks
• early Pleistocene

• Lithofacies (Upper): Volcanic mudflow deposit
• Lithofacies (Lower): Pyroxene andesite tuff breccia, Volcanic breccia
• Lithofacies (Lower, Minor): Pyroxene andesite lava, Lapilli tuff, Pyroxene olivine basalt pyroclastic rocks

• Source: Izumigatake volcano
• Thickness: 500 m or thicker
• Lower limit: Unconformity (Miyatoko Tuff Member, Higashihara Formation, Shirasawa Formation, Nanakita Formation, Otsutsumi Formation, Wakahata Formation, Akakuzureyama Lava)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Arakawa river - Hirasawa - Koguriyama - Ojojihara, Shikama city, Kami county, Miyagi pref.; Neshiroishi, Izumi ward, Sendai city, Miyagi pref.

• Miyamoto et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.27-46 DOI
• Kitamura et al. (1983) Geology of the Yoshioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 50p. (in Japanese with English abstract 5p.)
• Kitamura et al. (1981) Geology of the Furukawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 4p.)