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Nanakura Pyroclastic Dikes Harayama et al., 1991

• Intrusive rocks
• One of vents of Shirasawatengu Rhyolite?
• Pleistocene
• Intruded in: Oshirasawa Granite, Kurobegawa Granite, Sarusuberi Granophyre

• Sedimentary facies: Pyroclastic dyke
• Sedimentary facies: Vent-fill breccia?
• Lithofacies: Tuff breccia, Welded tuff

• Distribution: Takasegawa river - Nanakura dam - Nanakurasawa creek, Omachi city, Nagano pref.

• Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)