Abstract
The lower terrace named Hiyoshi-cho Terrace of the eastern part of Hakodate City has three facies sediments. The lower horizon consists of sand and gravels, the middle horizon of clay and silt, the upper horizon sand and gravels respectively. According to the studies of diatoms, the middle horizon was sedimented under marine environment and the upper hirozon was deposited in fresh water. This lower terrace may be correlated with the Shimosueyoshi formation of Kanto Plain.
