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Yokodake Basal Lava

Abbr.: Y1

• Type locality: northern part of Mount Yatsugatake, Nagano prefecture
• Volcanic rocks
• Pleistocene

• Lithofacies: Obsidian, Pitchstone, Hornblende hypersthene augite andesite lava

• Distribution (East - West): 3.5 km
• Distribution (South - North): 2 km
• Upper limit: Shimagareyama-toho Lava, Amaike-toho Lava, Unconformity (Kutsushitajo Lava, Apronjo Lava)

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

• Distribution: Mount Yokodake, Chino city, Nagano pref.

• Nishiki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.193-211 DOI
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)