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Sone Group

• Type locality: Yamanashi prefecture
• Coherent formation
• Pleistocene (ca. 0.48 Ma, ¹⁴C)

• Sedimentary facies: Volcanic mudflow deposit
• Sedimentary facies (Minor): Marsh
• Lithofacies: Andesitic gravels, Sands, Mud, Tuff breccia
• Sedimentary structures: Cross stratificaiton

• Distribution: Sone hills, Kofu city, Yamanashi pref.
• Fossils (Plants): Cleditschia horridia, Corylus heterophylla, Fagus japonica, Humulus japonica, Picea maximowiczii, Thujopsis dolabrata, Trapa macropoda var. bicreata

• Katada (1956) Kofu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 4p.)