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Ebiradake Lava

Invalid synonym: Kazafukidakegairinzan Lava

• Volcanic rocks
• Somma of the horseshoe caldera
• late Pleistocene (0.08 - 0.06 Ma; 0.07 Ma, K-Ar)

• Lithofacies: Olivine augite quartz biotite hornblende dacite
• Lithofacies (Minor): Hypersthene augite hornblende quartz biotite olivine andesite
• Lithofacies: Lava, Volcaniclastic rocks
• Lithofacies (Minor): Dacite pyroclastic flow deposit

• Thickness: 200 m or thicker
• Thickness (Lava): 50 m or thicker
• Lower limit: Unconformity (Norikurazawa Lava)

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

• Distribution: Mount Ebiradake - Minamimatazawa creek - Karamatsuzawa creek, Otari city, Kitaazumi county, Nagano pref.; Udogawa river - Himekawa river, Itoigawa city, Niigata pref.

• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)