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Higashihara Formation Isozaki, 1976 ex Kitamura et al., 1981

• Type locality: Higashihara, Shikama city, Kami county, Miyagi prefecture
• Coherent formation
• Pleistocene
• Contemporaneous heterotopic facies: Takashimizu Formation, Iketsuki Tuff, Shimoyamasato Tuff

• Lithofacies (Upper): Pumice tuff
• Lithofacies (Lower): Conglomerate
• Lithofacies (Minor): Lapilli tuff, Tuff breccia, Sandstone, Siltstone

• Thickness: 20 - 50 m
• Upper limit: Unconformity (Arakawa Pyroclastic Rocks, Higher Terrace Deposit)
• Lower limit: Unconformity (Miyatoko Tuff Member, Onoda Formation, Sanbongi Formation)

• Distribution: Higashihara - Mount Atago, Shikama city, Kami county, Miyagi pref.; Naruse river, Onoda, Kami city, Kami county, Miyagi pref.; Hikouemon bridge - Shimotabata, Ohira city, Kurokawa county, Miyagi pref.

• 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.)