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Iwao Formation Yagi, 1936

Invalid synonym: Ueda Mudflow Deposit

• Coherent formation
• Fluvial deposit older than Asama volcano products
• Pleistocene

• Sedimentary facies: Fluvial
• Lithofacies: Gravels

• Lower limit: Unconformity (Uryuzaka Formation)

• 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.)