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Takai Volcanic Rocks (Yagi, 1941) Akahane, 1976 (Photo)

Invalid synonym: Takai Lava

• Type locality: Kanakura forest road, Yamanouchi city, Shimotakai county, Nagano prefecture
• Volcanic rocks
• late Miocene - early Pliocene (2.1 - 1.4 Ma, K-Ar)
• Intruded by: Komaruyama Lava

• Sedimentary facies: Terrestrial
• Lithofacies: Hypersthene augite andesite lava
• Lithofacies (Minor): Hypersthene augite andesite pyroclastic rocks
• Lithofacies (Bottom): Hyaloclastite

• Thickness: 300 - 400 m
• Upper limit: Abut unconformity (Shiga Lake Deposit), Unconformity (Hirao Volcanic Rocks, Ryuo Volcanic Rocks, Kayanotaira Pyroclastic Flow Deposit, Oinokura Lava, Hafu Lava, Omeshi Lava, Lower Myojin Lava, Kenashi Lava, Azumaya volcano, Yokoteyama Lava, Kusatsu-Shirane volcano)
• Lower limit: Unconformity (Shiga Green Volcanic Rocks, Zakogawa Formation, Akiyamago Formation)

• Distribution: Sakae city, Shimominochi county, Nagano pref.; Kanakura forest road - Mount Gorin - Mount Ryuo - Mount Takappyo - Mount Bodera - Mount Iwasuge, Yamanouchi city, Shimotakai county, Nagano pref.; Ogushi mine - Mount Omeshidake - Mount Kuroyusan- Manza hot spring - Yokoteyama mine, Tsumagoi city, Agatsuma county, Gunma pref.
• Deposits (Sulphur): Ogushi mine

• Igarashi et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.11, pp.565-584 DOI
• 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.)
• Ota (1957) Kusatsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 8p.)
• Ota and Katada (1955) Suzaka, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 6p.)