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Hirasawa Scoria

Possibly same as the scoria bed in Mitsugashira

• Tephra
• middle Pleistocene

• Lithofacies: Basaltic? scoria (more than a few hundred units)

• Thickness (A unit): 10 - 80 cm

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

• Distribution: Hirasawa - Hirasawa pass - Daimon river, Minamimaki city, Minamisaku county, Nagano pref.; Nenbahara - Mount Utsukushimori, Hokuto city, Yamanashi pref.

• Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)