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Oirizawa Lava Igarashi et al., 1984

• Type locality: Okushiga forest road, Sakae city, Shimominochi county, Nagano prefecture
• Volcanic rocks
• Pleistocene

• Lithofacies: Hypersthene augite andesite lava
• Lithofacies (Minor): Hypersthene augite andesite volcanic breccia

• Thickness: 200 m or thinner
• Upper limit: Unconformity (Takakurayama Lava, Ojiroyama Lava)
• Lower limit: Unconformity (Tsubono Pyroclastic Rocks)

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

• Distribution: Okushiga forest road - Oirizawa creek - Amashiro creek, Sakae city, Shimominochi county, Nagano pref.

• Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)