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Mitsuyama Formation

• Type locality: Oshizawa? creek, Sakae city, Shimominochi cuonty, Nagano prefecture
• Volcanic rocks
• Pleistocene
• Correlation: Kusso Formation

• Sedimentary facies: Mudflow deposit
• Lithofacies (Upper): Hypersthene augite andesite volcaniclastic rocks
• Lithofacies (Lower): Quartz-bearing augite andesite volcaniclastic rocks

• Thickness: 500 m or thicker
• Lower limit: Conformity, partly unconformity (Shikumigawa Formation), Unconformity (Higashinosawa Formation, Kawakurumizawa Lava)

• Distribution: Oshizawa? creek - Higashinosawa creek - Usumaru creek - Mount Mitsuyama, 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.)