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Takenoyu Volcanics Member Kosaka et al., 2022

Invalid synonym: Ayashizawa Volcanics Member, Ayashizawa Volcanics Facies, Takeshi Formation

• Type locality: Takenoyu hot spring, Takeshi, Ueda city, Nagano prefecture
• Volcanic rocks
• middle Miocene
• Contemporaneous heterotopic facies: Yamada Sandstone and Conglomerate Member, Asamatoge Sandstone and Mudstone Member
• Intruded by: Quartz diorite

• Lithofacies: Hornblende andesit - Basalt lava, Tuff breccia, Lapilli tuff
• Lithofacies (Minor): Hyaloclastite
• Lithofacies (Upper, Minor): Andesitic - Basaltic sandstone, Tuffaceous sandstone
• Lithofacies (Lower, Minor): Sandstone, Conglomerate

• Thickness: 180 - 2,000 m or thicker
• Upper limit: Conformity (Reisenji Volcanics Member, Reisenji Volcanics Member), Unconformity (Enrei Volcanic Rocks)

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

• Distribution: Takenoyu hot spring - Mozawagawa river - Ozawanegawa river - Yorigawa river - Funegasawa creek - Sakaizawa creek, Ueda city, Nagano pref.; Ochiai - Omozawa creek - Nagakubo, Nagawa city, Chiisagawa county, Nagano pref.

• Kosaka et al. (2022) Earth Science (Chikyu Kagaku), vol.76, no.4, pp.179-194 DOI
• Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)