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Ok1 Tephra

Abbr.: Ok1

• Tephra
• Pliocene

• Lithofacies: Crystalline volcanic ash
• Lithofacies (Upper): Pumice

• Host: Zushi Formation, Hatsuse Formation, Misaki Formation
• Thickness: 40 cm
• Thickness (Upper): 10 cm

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Mount Ogusuyama - Kurihama - Abekura - Nagase, Yokosuka city, Kanagawa pref.; Kannonhana seashore - Cape Tenjinnzaki, Sajima, Yokosuka city, Kanagawa pref.; Kikuna, Minamishimoura town, Miura city, Kanagawa pref.

• 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.)