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My-TB Tephra Niigata Volcanic Ash Research Group, 1983

Abbr.: My-TB

Invalid synonym: Lap. 1.5

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

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

• Source: Sekita mountains, Niigata pref. - Nagano pref.
• Thickness: 5 - 100 m or thicker
• Host: Uonuma Formation, Nakajogawa Member

• Distribution: Asagawara - Tagawa river - Hanekawa river, Tokamachi city, Niiagata pref.; Taruta river, Tsunan city, Nakauonuma county, 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.)
• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)