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Iwayama Lavas
- Volcanic rocks
- middle - late Pleistocene (ca. 0.14 Ma, K-Ar)
- Lithofacies: Olivine quartz-bearing orthopyroxene clinopyroxene andesite Lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Fukushima pref.
- Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)