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As-B Tephra
Abbr.: As-B
- Tephra
- Holocene (AD 1108)
- Lithofacies: Pyroxene andesite pumice
- 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.)