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Yokoteyama Lava

A part of Hirao Volcanic Rocks had been called as Yokoteyama Lava

• Volcanic rocks
• Neogene - Pleistocene

• Lithofacies: Quartz-bearing olivine two-pyroxene andesite

• Upper limit: Unconformity (Kusatsu-Shirane volcano, Higher Terrace Deposit)
• Lower limit: Unconformity (Takai Volcanic Rocks, Kuresaka Lava)

• Distribution: Mount Yokoteyama - Shibu pass - Yamada pass, Nakanojo city, Agatsuma county, Gunma pref.; summit of Mount Manzayama - Manza pass - Mount Kuroyuyama, Tsumagoi city, Agatsuma county, Gunma pref.

• Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)
• Ota (1957) Kusatsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 8p.)