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Tt1 Tephra Takeuchi and Kato, 1994

Abbr.: Tt1

• Type locality: Iida river, Sakurataki, Maki ward, Joetsu city, Niigata prefecture
• Tephra
• Miocene
• Correlation: Top of Matsunoyama Formation

• Lithofacies: Pumice tuff
• Sedimentary structures (Upper): Parallel stratification

• Host: Taruda Formation
• Thickness: ca. 18 m

• Distribution: Iida river, Sakurataki - Takao - Uro, 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.)