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Soma Agglomerate Formation Ozawa, 1962

Invalid synonym: Soma Volcanic Rocks

• Type locality: Byobuiwa, Soma, Hirosaki city, Aomori prefecture
• Volcanic rocks
• Pliocene
• Contemporaneous heterotopic facies: Taiaki Formation, Matsukitai Formation?
• Intruded by: Rhyolite dyke

• Lithofacies: Andesitic agglomerate, Andesitic tuff breccia
• Lithofacies (Minor): Andesitic lapilli tuff, Andesitic tuff, Andesite lava, Acidic tuff, Rhyolite lava

• Thickness: 300 - 700 m
• Upper limit: Interfingered (Higashimeya Formation)
• Lower limit: Conformity, partly unconformity (Tochinaigawa Formation)

• Distribution: Byobuiwa, Soma, Hirosaki city, Aomori pref.; Sawada, Nishimeya city, Nakatsugaru county, Aomori pref.
• Fossils: Shellfishes

• Ozawa (1962) Hirosaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 5p.)