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Matsuiwa Lava

• Volcanic rocks
• Early Pleistocene

• Lithofacies: Two-pyroxene andesite

• Lower limit: Unconformity (Yodate Lava)

• Distribution: summit of Mount Matsuiwasan, Nakanojo city, Agatsuma county, Gunma pref.

• 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.)