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Osaki volcano Oikawa and Ishizuka, 2011

• Type locality: Osaki seashore, Usami, Ito city, Shizuoka prefecture
• Volcanic rocks
• Stratovolcano
• Pleistocene (ca. 0.75 - 0.65 Ma, K-Ar)

• Sedimentary facies: Terrestrial
• Sedimentary facies (Upper, Minor): Marine
• Sedimentary facies (Upper, Minor): Hyaloclastite
• Lithofacies: Tholeiite
• Lithofacies (Upper): Clinopyroxene orthopyroxene andesite, Orthopyroxene clinopyroxene andesite lava
• Lithofacies (Middle): Olivine basalt, Clinopyroxene olivine basalt aa lava, Scoria breccia
• Lithofacies (Lower): Clinopyroxene orthopyroxene andesite lava
• Lithofacies (Lower, Minor): Andesite pyroclastic breccia, Tuff breccia

• Source: north of Cape Osaki
• Thickness (Upper): 100 m or thicker
• Thickness (Middle): 10 m or thinner
• Thickness (Lower): 30 m or thicker
• Upper limit: Unconformity (Ajiro volcano)
• Lower limit: Unconformity (Usami volcano)

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

• Distribution: Osaki seashore - Tomatta, Usami, Ito city, Shizuoka pref.

• Oikawa and Ishizuka (2011) Geology of the Atami District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 61p. (in Japanese with English abstract 3p.)