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Tr-TB Tephra Niigata Volcanic Ash Research Group, 1983

Abbr.: Tr-TB

• Type locality: Asagawara, Tokamachi city, Niiagata prefecture
• Tephra
• Pleistocene

• Sedimentary facies: Debris avalanche deposit, Lahar deposit
• Lithofacies: Muddy volcanic ash

• Host: Uonuma Formation, Koikegawa Member
• Thickness: 7 m or thinner
• Lower limit: Conformity (Srt-SK100 Tephra)

• Distribution: Asagawara, Tokamachi city, Niiagata pref.; Miyanaka - Anyoji, Tokamachi city, Niigata pref.

• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)