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Usunaka Rhyolite

• Type locality: Hosoo pass, Nanto city, Toyama prefecture
• Volcanic rocks
• Miocene (2.5 - 2.4 Ma, K-Ar)

• Lithofacies: Rhyolite welded tuff

• Distribution: Hosoo pass, Nanto city, Toyama pref.; Togagawa river - Kitajima - Uwabatake - Sakaue - Suganuma - Iritani, Toga town, Nanto city, Toyama pref.

• Nozawa et al. (1981) Geology of the Shirokimine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 10p.)