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Hrp Tephra Kurokawa et al., 1995

Abbr.: Hrp

Invalid synonym: Shiraiwa Tuff

• Type locality: Shiraiwa-shimizu, Hiramaru, Myoko city, Niigata prefecture
• Tephra
• Pliocene (3.1, 2.9 Ma, FT)
• Correlation: Hap-2

• Lithofacies: Pumiceous volcanic ash

• Host: Seguchi Formation
• Thickness: 3.5 - 20 m or thicker

• Distribution: Shiraiwa-shimizu, Hiramaru, Myoko city, Niigata pref.; Baba river - Doro, Myoko city, Niigata pref.

• 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.)