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Hijiriyama Volcanics Iijima et al., 1968

• Type locality: Hijirikogen toll road, Omi city, Higashichikuma county, Nagano prefecture
• Volcanic rocks
• early Pliocene (5.4 Ma, K-Ar)

• Lithofacies: Anesite - Basalt lava, Agglomerate, Tuff breccia, Volcanic breccia

• Thickness: ca. 200 m or thicker
• Upper limit: Unconformity (Shinoyama Volcanics, Ooka Mudflow Deposit, Omachi Tephra)
• Lower limit: Unconformity (Komiji Formation, Susobana Formation, Kamuriki Formation, Nagaiwa Member)

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

• Distribution: Mount Hijiri, Nagano city - Omi city, Higashichikuma county, Nagano pref.; Mount Takao - Mount Tararayama, Chikuma city, Nagano pref.

• Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
• Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)
• Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)
• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)