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Older Fan Deposits

• Coherent formation
• Holocene

• Sedimentary facies: Alluvial van deposit
• Lithofacies: Andesite gravels, Sands

• Thickness: 3.5 - 20 m
• Upper limit: Unconformity (Older Dune Deposits)
• Lower limit: Unconformity (Nishime Formation, Chokai volcano products, Kotaki Mudflow Deposits)

• Distribution: Naso river, Kisakata town, Nikaho city, Akita pref.

• Ozawa et al. (1982) Geology of the Kisakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 4p.)