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Hamana Formation

• Type locality: Hamana, Imabetsu city, Higashitsugaru county, Aomori prefecture
• Coherent formation
• Pleistocene

• Lithofacies: Interbedded sands and gravels
• Lithofacies (Minor): Clay, Lignite

• Lower limit: Unconformity (Imabetsu Andesites, Mimmaya Rhyolites, Kanita Formation)

• Distribution: Hamana, Imabetsu city, Higashitsugaru county, Aomori pref.; Yamazaki - Nakauda creek, Imabetsu city, Higashitsugaru county, Aomori pref.; Masukawa, Sotogahama city, Higashitsugaru county, Aomori pref.
• Fossils: Bivalves (Corbicula sp.), Plants (Styrax sp., Alunus sp., Quercus? sp., Brasenia sp., Trapa sp.)

• Saito and Uemura (1957) Horozuki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 7p.)
• Ota et al. (1957) Mimmaya, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 30p. (in Japanese with English abstract 5p.)