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Katsuma Formation

• Type locality: Katsuma, Usuda, Saku city, Nagano prefecture
• Coherent formation
• Pleistocene

• Sedimentary facies: Marsh
• Lithofacies: Mud, Scoria
• Sedimentary structures: Foliation

• Thickness:2 m

• Distribution: Katsuma, Usuda, Saku city, Nagano pref.

• Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)