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Ibaraki Clay Formation Sakamoto, 1972

• Coherent formation
• Pleistocene
• Correlation: Upper Joso Formation

• Sedimentary facies: Volcanic ash deposit under water
• Lithofacies: Sand-bearing clay, Gravel-bearing clay

• Thickness: 0.7 - 4 m
• Lower limit: Unconformity (Lower Miwa Formation = Namegata Member)

• Distribution: Ibaraki pref.

• Sakamoto et al. (1981) Geology of the Ishioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 50p. (in Japanese with English abstract 3p.)
• Sakamoto (1975) Geology of the Isohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)
• Sakamoto et al. (1972) Geology of the Nakaminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 5p.)