[ Top ] [ Japanese ]

Yonezawa Lava

• Volcanic rocks
• Pleistocene

• Lithofacies: Olivine-bearing two-pyroxene andesite
• Lithofacies (Minor): Two-pyroxene andesite, Hornblende two-pyroxene andesite
• Lithofacies (Basal): Tuff breccia

• Thickness: ca. 250 m
• Thickness (A unit): ca. 5 m
• Thickness (Basal): ca. 10 m
• Upper limit: Unconformity (Kurumayama Lava)
• Lower limit: Unconformity (Mushikura Lava)

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

• Distribution: Kitaoshio pass, Yonezawa, Chino city, Nagano pref.

• Sawamura and Owa (1953) Suwa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 4p.)