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T4 Tephra Saito, 1956

Abbr.: T4

Invalid synonym: T₄

• Tephra
• Pliocene - Pleistocene (1.73, 1.6 Ma, K-Ar; 1.7, 1.52 Ma, FT)
• Correlation: Omine Pyroclastic Flow Deposit, TZ100

• Lithofacies: Vitreous volcanic ash, Pyroclastic flow units (2 flow units)

• Host: sarumaru Formation, Ogawa Formation
• Thickness: ca. 10 - 30 m or thicker

• Distribution: Miyanomae, Togakushi, Nagano city, Nagano pref.

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)
• Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)