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OP1 Tephra

Abbr.: OP1

Invalids synonym: Pm-1A

• Tephra
• Pleistocene

• Lithofacies: Volcanic ash, Pumice

• Source: Mamahahadake volcano group

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

• Distribution: Nagano pref.

• Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)