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KK20 Tephra Kurokawa et al., 2002

Synonym.: KK20

• Type locality: Komaoka forest road, Komaoka, Kamo city, Niigata prefecture
• Tephra
• Pliocene (ca. 1.5 Ma)

• Lithofacies: Tuff
• Sedimentary structures: Parallel foliation

• Host: Kakuma Formation
• Thickness: 10 cm

• Distribution: Komaoka forest road, Komaoka, Kamo 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.)