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Hosoonotaki Volcanics Member (Sugiyama et al., 1973) Yamada et al., 2004

Invalid synonym: Hosoonotaki Volcanics Facies, Hosoonotaki Andesite, Inaguratoge Andesite, Fujiyama Formation

• Type locality: Hosoonotaki fall, Hosoo, Ueda city, Nagano prefecture
• Volcanic rocks
• middle Miocene
• Contemporaneous heterotopic facies: Kokuzo Basalt Member, Kariyahara Sandstone and Mudstone Member

• Lithofacies: Andesite lava (Perlite)
• Lithofacies (Minor): Sandstone, Andesite - Dacite tuff

• Thickness: 500 - 2,000 m
• Lower limit: Conformity (Ichinose Sandstone and Conglomerate Member)

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

• Distribution: Misayamatoge pass - Mount Toyamine - Inaguratoge pass - Mount Ibukajoyama - Mount Keshibozuyama - Metobagawa river, Matsumoto city, Nagano pref.; Hosoonotaki fall - Maruko - Mount Tokko - Tezuka, Ueda city, Nagano pref.

• Kosaka et al. (2022) Earth Science (Chikyu Kagaku), vol.76, no.4, pp.179-194 DOI
• Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)
• 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.)