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Stw Tephra Higuchi et al., 2001

Synonym.: Stw

• Type locality: Kakuma river, Sanjo city, Niigata prefecture
• Tephra
• Pliocene (ca. 2.5 Ma)
• Correlation: Ktw

• Lithofacies: Tuff
• Sedimentary structures: Parallel foliation

• Host: Minagawa Formation
• Thickness: 20 - 70 cm

• Distribution: Kakuma river - Magaritani, Sanjo city, Niigata pref.

• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)