The Quaternary deposits of Koriyama City and its environs from stratigraphical and topographical studies are divided into several formations and terraces, respectively. The stratigraphic units recognized are the Pleistocene Koriyama formation, the Iwashiro-atami terrace deposits, the Nishino-uchi terrace deposits, the Ogibukuro terrace deposits, the Arayashiki terrace deposits, the Tamagawa terrace deposits, the Holocene lower terrace deposits and the river deposits. The depositional plane of the Koriyama formation is preserved and represented by the flat surface and the depositional planes of each of the mentioned terrace deposits are preserved and represented by the suceessive terrace surfaces. No volcanic ash covering on the depositional plane of each of the formation and the terrace deposits is found in this area. From stratigraphical and geomorphological features correlation of the deposits and the terraces is undertaken with the result shown in Table 2. Especially, the KOriyama formation intercalates the peat beds at the three horizons, and contains the many plant fossils. The plant fossil assemblages from each of the three peat beds are somewhat varied in the floral composition,