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As-SP Tephra Machida et al., 1984

Abbr.: As-SP

• Tephra
• Pleistocene (ca. 20 ka)

• Lithofacies: Hornblende-bearing pyroxene dacite pumice

• Source: Hotokeiwa volcano
• Thickness: ca. 1 m

• Distribution: Gonda, Takasaki city, Gunma pref.

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)