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Mamioka Tuff (Kawai and Yamada, 1960) Ito et al., 2022

• Type locality: Mount Tenjin, Kasakake town, Midori city, Gunma prefecture
• Coherent formation
• late Miocene (10.8 Ma, FT)

• Sedimentary facies: Shallow marine
• Lithofacies: Tuffaceous sandstone

• Thickness: ca. 50 m
• Upper limit: Abut unconformity (Nashiki Debris Avalanche Deposit)
• Lower limit: Unconformity

• Distribution: Gunma pref.
• Fossils: Pecten sp., Scaphopods

• Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)