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Nishigawara Formation Kato and Akahane, 1986

• Type locality: Nishigawara, Amori, Nagano city, Nagano prefecture
• Coherent formation
• early Pleistocene

• Lithofacies: Conglomerate
• Lithofacies (Minor): Welded tuff

• Thickness: 70 - 80 m or thicker
• Upper limit: Unconformity (Toyono Formation, Minamigo Formation)
• Lower limit: Abut unconformity (Susobana Formation)

• Distribution: Nishigawara, Amori, Nagano city, Nagano pref.; Shiroiwa, Susobana river, Nagano city, Nagano pref.

• 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.)