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Gamanosawa Formation Kuwano, 1958

• Coherent formation
• Miocene

• Sedimentary facies: middle - late Marine
• Lithofacies (North): Shale, Mudstone
• Lithofacies (South): Siltstone
• Lithofacies (South, Minor): Tuff

• Thickness: 800 m or thicker
• Upper limit: Unconformity (Sunagomata Formation)

• Distribution: Gamanosawa, Higashidori city, Shimokita county, Aomori pref.; Mena river, Taya, Higashidori city, Shimokita county, Aomori pref.
• Fossils: Sponges (Makiyama chitanii), Foraminifera (Cyclammina sp.), Echinoids, Bivalves (Dosinia sp., Yoldia sp.)

• Imai (1961) Chikagawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 4p.)