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As-A Tephra

Abbr.: As-A

• Tephra
• Holocene (AD 1783)

• Lithofacies: Pyroxene andesite pumice

• Source: Maekake volcano
• Thickness: ca. 30 cm

• Distribution: Sengadaki fall, Matsuida town, Annaka 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.)