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Hr Tephra Ibaraki, 1986

Abbr.: Hr

• Type locality: Hirugaya, Makinohara city, Shizuoka prefecture
• Tephra
• Pliocene - early Pleistocene (4.1 Ma, FT)

• Lithofacies: Silty volcanic ash

• Host: Horinouchi Alternation
• Thickness: ca. 1 - 2 m

• Distribution: Hirugaya - Wada, Makinohara city, Shizuoka pref.

• Sugiyama et al. (1988) Geology of the Omaezaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 153p. (in Japanese with English abstract 6p.)