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Ywg Tephra Kurokawa et al., 1987

Abbr.: Ywg

• Type locality: Yamada, Teradomari, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene - Pleistocene

• Sedimentary facies: Turbidite
• Lithofacies: Vitreous volcanic ash (ca. 25 units)

• Host: Nishiyama Formation

• Distribution: Yamada - Shido bridge - Ochimizu, Teradomari, Nagaoka city, Niigata pref.; Nakayama - Inagawa, Izumozaki city, Santo county, Niigata pref.

• Kobayashi et al. (2002) Geology of the Sanjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 98p. (in Japanese with English abstract 4p.)
• Kobayashi et al. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)