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Gamaharayama Lava Nakano et al., 2002
Invalid synonym: Ichinanbayama Lava
- Volcanic rocks
- middle Pleistocene (0.53 Ma, K-Ar)
- Lithofacies: Olivine-bearing hypersthene augite andesite lava, Tuff breccia
- Lithofacies (Lower): Hypersthene augite andesite lava
- Lithofacies (Minor): Breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Gamaharayama - Gamaharazawa creek - Maezawa creek - Kamisukiyama farm - Kitamatazawa creek, Otari city, Kitaazumi county, Nagano pref.; Mount Ichinanbayama, 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.)