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As-YP Tephra Arai, 1962

Abbr.: As-YP

• Tephra
• Pleistocene (16 - 15 ka)

• Lithofacies (Upper): Volcanic sands
• Lithofacies: Pyroxene andesite pumice
• Sedimentary structures (Upper): Parallel stratification

• Source: Hotokeiwa volcano
• Host: Tawara Loam, Osato Loam
• Thickness: 3 - 100 cm
• Upper limit: Unconformity (Mizusawayama Lava, Mizusawayama Pyroclastic Flow Deposit and Talus Deposit)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Ishizue, Takanezawa city, Shioya county, Tochigi pref.; Ashinuma town - Imazato town, Utsunomiya city, Tochigi pref.; Tagawa river, Tokujiro town - Yokoyama town, Utsunomiya city, Tochigi pref.; Kaminokawa city, Kawachi county, Tochigi 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.)
• Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)