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Iwao Formation Yagi, 1936
Invalid synonym: Ueda Mudflow Deposit
- Sedimentary facies: Fluvial
- Lithofacies: Gravels
- Distribution: Iwao - Sarukubo - Shionada, Saku city, Nagano pref.; Mimitori, Komoro city, Nagano pref.
- Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)