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Hk Tephra Mizuno et al., 1987

Abbr.: Hk

• Type locality: Yamada, Hiki, Omaezaki city, Shizuoka prefecture
• Tephra
• middle Miocene - Pliocene

• Lithofacies: Volcanic ash

• Host: Hiki Alternation
• Thickness: ca. 30 cm

• Distribution: Hiki, Omaezaki 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.)