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Yukawadani Volcanic Rocks

• Volcanic rocks
• Pleistocene (0.22 - 0.20 Ma)

• Sedimentary facies (Upper): Terrestrial
• Sedimentary facies (Lower): Subaqueous
• Lithofacies (Upper): Hornblende hypersthene augite andesite lava, Pyroclastic rocks
• Lithofacies (Lower): Andesite lapilli tuff, Tuff breccia
• Lithofacies (Lower, Minor): Conglomerate, Sandstone, Siltstone
• Lithofacies (Minor): Hypersthene augite quartz biotite hornblende dacite lava

• Thickness: 700 - 1,000 m or thicker
• Upper limit: Unconformity (Dashiwaradani Lava, Lower Washidake lava, Upper Washidake lava)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Yukawa valley - Matsuodani valley - Shinyu hotspring - Usagidani valley - Kunimidani valley, Tateyama city, Nakaniikawa county, Toyama pref.

• Nakano et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.37-48 DOI
• Harayama et al. (2000) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 218p. (in Japanese with English abstract 6p.)