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Kuwabara Volcanics Saito, 1982

• Type locality: Kosaka - Otawara, Kuwabara, Chikuma city, Nagano prefecture
• Volcanic rocks
• Miocene - Pliocene
• Intruded by: Porphyrite

• Lithofacies: Augite pyroxene andesite lava
• Lithofacies (Minor): Volcanic breccia

• Thickness: 200 m
• Upper limit: Unconformity (Hijiriyama Andesite, Older Obasute Mudflow Deposit)
• Lower limit: Unconformity (Susobana Formation)

• Distribution: Kosaka - Otawara, Kuwabara, Chikuma city, Nagano pref.; Mount Shinoyama - Mount Takao - Sano river - Nakazawa river - Nakamura river, Chikuma city, Nagano pref.
• Deposit: Bontenyama pyrophyllite deposit

• Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)