Abstract
The stratigraphy and transitions of sedimentary environments in the latest Pleistocene to Holocene incised valley-fills in the Shibakawa Lowland are revealed based on sedimentary facies, physical properties and chemical element contents in the GS-KZK-1 core, Kawaguchi City, Saitama Prefecture. A transverse section based on several existing core data is also examined.
The sedimentary succession is composed of Pleistocene Shimosa Group and Post-glacial incised-valley fills. The latter is subdivided into six units in ascending order; river channel fills, floodplain deposits, inner-bay deposits, tidal channel deposits, inner-bay deposits, salt marsh to back marsh deposits.
The transverse section indicates that the basal gravels in the valley fill may have been derived from the gravelly layers in the Pleistocene Shimosa Group and sandy layers in the middle and upper parts do not cover the entire valley, which is mostly filled with muddy sediments.
