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Hirao Volcanic Rocks Akahane, 1976

Invalid synonym: Higashitateyamagata Lava, Yokoteyama Lava

• Type locality: Mount Higashitate, Yamanouchi city, Shimotakai county, Nagano prefecture
• Volcanic rocks
• early Pleistocene (1.14 - 0.87 Ma, K-Ar)

• Lithofacies: Pyroxene andesite lava, Pyroclastic rocks

• Thickness: 200 - 300 m
• Upper limit: Unconformity (Ryuo Volcanic Rocks, Shimizudairarindo Lava, Kayanotaira Pyroclastic Flow Deposit, Ochiai Lake Deposit)
• Lower limit: Unconformity (Takai Volcanic Rocks)

• Distribution: Mount Higashitate - Yomase river - Tarukawa river, Yamanouchi city, Shimotakai county, Nagano pref.

• Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)