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Sakayachi Formation (Togashi et al., 1999)

• Type locality: Sakayachi wetland, Nagano city, Nagano prefecture
• Coherent formation
• Pleistocene - Present (0.1 - 0.0 Ma; 48,660 - 7,310 yBP, ¹⁴C)

• Sedimentary facies: Swamp
• Lithofacies: Peat
• Lithofacies (Minor): Silt, Volcanic ash

• Thickness: 13 m
• Lower limit: Unconformity (Loam)

• Distribution: Sakayachi wetland, Nagano city, Nagano pref.
• Tephra: Aso-4, DKP

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)