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Koikeyama Lavas Ota and Katada, 1955

• Volcanic rocks
• Middle Pleistocene (0.81 - 0.75 Ma, K-Ar)

• Lithofacies: Lava
• Lithofacies: Orthopyroxene-clinopyroxene basaltic andesite

• Upper limit: Unconformity
• Lower limit: Unconformity

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

• Distribution: Fudo fall, Mount Azumaya, Nagano pref., Oyoko river - Maseido river, Mount Azumaya, Nagano pref.

• Nishiki et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.3, pp.89-103 DOI
• Ota and Katada (1955) Suzaka, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 6p.)