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Shiga Welded Tuff Nagano Chigaku-kai, 1962

• Tephra
• Pliocene (3.3 - 3.12 Ma, K-Ar)
• Correlation: Chausuyama Welded Tuff Member

• Lithofacies: Andesite welded tuff

• Source: south of Usui pass (Gunma pref.)
• Thickness: 200 m
• Upper limit: Unconformity (Kasuga Volcanic Rocks, Mizuochikannon Basalt)

• Distribution: Mount Inariyama - Kumakubo - Uchiyama valley - Ohira, Saku city, Nagano pref.; Inariyama, Usuda, Saku city, Nagano pref.; Nukui river, Ohinata, Sakuho city, Minamisaku county, Nagano pref.

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)
• 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.)
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)