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Taroyama Formation (Yamagishi, 1964)

Invalid synonym: Taroyama Member

It had been treated as a member of Uchimura Formation.

• Type locality: Koganesawa river, Ueda, Ueda city, Nagano prefecture
• Coherent formation
• Miocene
• Correlation: Middle Uchimura Formation
• Intruded by: Porphyrite, Quartz diorite

• Lithofacies: Tuff, Tuff breccia
• Lithofacies (Minor): Shale

• Thickness: ca. 600 m
• Upper limit: Conformity (Yokoo Formation)
• Lower limit: Conformity (Omineyama Formation)

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

• Distribution: Koganesawa river, Ueda, Ueda city, Nagano pref.; Shimoshiojiri - Mount Kokuzosan, Ueda city, Nagano pref.; Mount Hatogamine - Mount Daidosan, Sanada town, Ueda city, Nagano pref.; Nasawa river - Mido river - Yagawa river, Sakaki city, Hanishina county, Nagano pref.
• Fossils: Fish scales

• Suzuki (2008) Jour. Geol. Soc. Japan, vol.114, no.10, pp.536-539 DOI
• Suzuki (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.43-46 DOI
• Suzuki (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.23-26 DOI
• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)