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Omineyama Formation (Yamagishi, 1964)

Invalid synonym: Omineyama Member

It had been treated as a member of Uchimura Formation.

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

• Lithofacies (Upper): Green volcanic rocks
• Lithofacies (Lower): Shale
• Lithofacies (Lower, Minor): Sandstone

• Thickness: 800 m or thicker
• Upper limit: Conformity (Taroyama Formation)

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

• Distribution: Koganesawa river, Ueda, Ueda city, Nagano pref.; Tanigawa, Sakaki city, Hanishina county, Nagano pref.
• Fossils: Makiyama chitanii

• 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.)