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Uchimura Formation (Honma, 1927)

Invalid synonym: Hachibuseyama Formation, Takabocchi Formation

• Type locality: Uchimuragawa river, Nishiuchi - Kakeyu hotspring, Ueda city, Nagano prefecture
• Volcanic rocks
• middle Miocene
• Correlation (Middle): Taroyama Formation
• Correlation (Lower): Omineyama Formation, upper Moriya Formation
• Intruded by: Quartz diorite

• Lithofacies (East): Basalt - Andesite lava, Volcanic breccia, Tuff breccia
• Lithofacies (East, Minor): Shale, Sandstone
• Lithofacies (West): Conglomerate, Sandstone, Mudstone

• Thickness: 2,600 m or thicker
• Upper limit: Conformity (Bessho Formation, Tazawa Mudstone Member), Unconformity (Hodonoirigawa Lavas, Sanjiro Volcaniclastics, Utsukushigahara Volcanics, Older Josho Lake Deposit, Shiokura Gravel?)

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

• Distribution: 1,600 m above sea level of Nonoiri river - Karasawa river, Nagawa city, Chiisagata county, Nagano pref.; Akashiba - Shinjizo pass, Nagano city, Nagano pref.; Numairi - Nishiuchi - Kakeyu hotspring - Maeyama - Uchimuragawa river - Takeshigawa river, Ueda city, Nagano pref.; Metobagawa river - Susukigawa river, Matsumoto city, Nagano pref.; Mount Hachibuseyama - Mount Takabocchiyama, Okaya city, Nagano pref.

• Kosaka et al. (2022) Earth Science (Chikyu Kagaku), vol.76, no.4, pp.179-194 DOI
• Mukai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.400-422 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.)
• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
• Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)
• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)