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Hk Tephra

Abbr.: Hk

Synonym: Higashikoji Tephra

• Type locality: Higashikoji, Hisagi, Zushi city, Kanagawa prefecture
• Tephra
• Pliocene (5.0, 3.7 Ma, FT; 5.2 Ma, K-Ar)
• Correlation: Ky21

• Lithofacies (Top): Scoria
• Lithofacies: Crystalline volcanic ash
• Sedimentary structures: Trough cross-stratification

• Host: Zushi Formation, Hatsuse Formation
• Thickness (Top): 10 - 50 cm
• Thickness: 2 - 3 m

• Distribution: Hisagi - Kotsubo - Yamanone - Numama, Zushi city, Kanagawa pref.; Kamoi, Yokosuka city, Kanagawa pref.; Kikuna, Minamishitaura town, Miura city, Kanagawa pref.

• Mori and Ogawa (2019) Jour. Geol. Soc. Japan, vol.125, no.10, pp.737-757 DOI
• Eto et al. (1998) Geology of the Yokosuka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 3p.)
• Kodama et al. (1980) Geology of the Misaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 38p. (in Japanese with English abstract 3p.)