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Idodake Lava and Pyroclastic Rocks Nanbu and Tanida, 1961

Synonym: Idodakesancho lava dome

• Type locality: Crater margin of Mount Ido, Aomori city, Aomori prefecture
• Post-caldera volcanoes
• Volcanic rocks
• Pleistocene (ca. 0.2 - 0.1 Ma; 0.07 Ma, K-Ar)

• Sedimentary facies: Lava dome, Lava flow
• Lithofacies (Lava dome): Olivine-bearing quartz hypersthene augite andesite
• Lithofacies: Lava

• Thickness: 20 - 50 m
• Distribution (Diamter): ca. 100 - 150 m
• Upper limit: Conformity? ()Idodake Pyroclastic Rocks, Unconformity (Odake 3rd-stage Lava, Odake Pyroclastic Rocks)
• Lower limit: Interfingered (Akakuradake Lava)

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

• Distribution: Mount Ido, Aomori city, Aomori pref.

• Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)