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Shiga Green Volcanic Rocks Akahane, 1980

• Type locality: Hoppo hot spring, Yamanouchi city, Shimotakai county, Nagano prefecture
• Volcanic rocks
• Miocene
• Correlation: Uchimura Formation, Suzaka Andesites
• Intruded in: Diorite porphyry, Quartz diorite

• Sedimentary facies: under water
• Lithofacies: Tuff, Tuff breccia
• Lithofacies (Minor): Lava, Tuffaceous mudstone, Sandstone
• Sedimentary structures: Parallel stratification

• Thickness: 300 - 400 m
• Upper limit: Abut unconformity (Yokoyugawa Lake Deposit), Unconformity (Takai Volcanic Rocks, Lower Karitasan Lava, Kayanotaira Pyroclastic Flow Deposit, Older Shigayama Volcanic Rocks)

• Distribution: Hoppo hot spring - Yokoyu river - Zako river - Hasuike pond, Otomi creek - Mount Gorin - Annandai - Makuiwa - Kitaokuma - Okuyamada - Takai, 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.)