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Yakushidake Rhyolites

Invalid synonym: Yakushidake cauldron

• Type locality (Upper): Mount Yakushidake, Arimine, Toyama city, Toyama prefecture
• Type locality (Lower): left bank of Kurobegawa river, Arimine, Toyama city, Toyama prefecture
• Volcanic rocks
• Late Cretaceous
• Intruded by: Granite porphyry dyke

• Lithofacies (Upper): Rhyolite welded tuff, Lava
• Lithofacies (Lower): Breccia, Tuff, Pumice tuff
• Lithofacies (Lower, Minor): Andesite lava

• Thickness (Upper): ca. 600 m
• Thickness (Lower): ca. 400 m
• Distribution (East - West): 2 km
• Distribution (South - North): 5.5 km
• Lower limit: Unconformity (Yakushizawamigimata Conglomerate Member)

• Distribution: Mount Yakushidake - Mount Mayama - Kurobegawa river, Arimine, Toyama city, Toyama 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.)