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Azumayama Gravel Bed Imamura, 1959

• Coherent formation
• Pliocene

• Sedimentary facies: Fluvial
• Lithofacies: Gravels

• Upper limit: Unconformity (Sanbe Pumice Fall Deposits)
• Lower limit: Unconformity (Mesozoic volcanic rocks)

• Distribution: Daizenbara - Mount Azumayama, Okuizumo city, Nita county, Shimane pref.

• Igi and Sakamoto (1977) Geology of the Tari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 7p.)