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Ama Formation Yamauchi et al., 1999

• Type locality: 360 - 580 m, boring core of Nakanoshima, Ama city, Oki county, Shimane prefecture
• Coherent formation
• middle Miocene
• Correlation: Tsuma Formation

• Sedimentary facies: Marine
• Lithofacies: Sandstone

• Distribution: 360 - 580 m, boring core of Nakanoshima, Ama city, Oki county, Shimane pref.

• Chiba et al. (2000) Geology of the Urago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 3p.)