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Tt2 Tephra Niigata University Research Group of Geology in Higashikubiki District, 1987

Abbr.: Tt2

• Tephra
• Miocene
• Correlation: Top of Matsunoyama Formation

• Lithofacies: Pumice tuff

• Host: Taruda Formation
• Thickness: 3.5 m

• Distribution: Honoki river, Kirikoshi, Yasuzuka ward, Joetsu city, Niigata pref.; Iida river, Maki ward, Joetsu city, Niigata pref.

• Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)