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Ryuo Volcanic Rocks Akahane et al., 1992

Invalid synonym: Ryuo Lava

• Type locality: Mount Ryuo, Yamanouchi city, Shimotakai county, Nagano prefecture
• Volcanic rocks
• early Pleistocene (10.7, 0.88 Ma, K-Ar)

• Lithofacies: Pyroxene andesite lava, Pyroclastic rocks

• Thickness: 150 - 200 m
• Lower limit: Unconformity (Takai Volcanic Rocks, Hirao Volcanic Rocks)

• Distribution: Mount Ryuo, 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.)