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Futamata Group

• Coherent formation
• early Miocene
• Correlation: Odaira Group

• Sedimentary facies: Marine
• Lithofacies (Upper): Conglomerate
• Lithofacies (Middle): Mudstone
• Lithofacies (Middle, Minor): Sandstone
• Lithofacies (Lower): Basal conglomerate, Sandstone

• Thickness (Upper): ca. 50 m
• Thickness (Middle): ca. 350 m
• Thickness (Lower): 50 m
• Lower limit: Unconformity (Komyo Group, Ishimakisan Unit, Suse Unit, Tame Unit)

• Distribution: Futamata town - Akura - Kamida, Tenryu ward, Hamamatsu city, Shizuoka pref.
• Fossils: Shellfishes

• Saito and Isomi (1954) Akihasan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 34p. (in Japanese with English abstract 10p.)