The Sand of Niigata Sand Dunes

The Geohistory of the Formation of Niigata sand Dunes, Part II

Abstract

The mechanical analysis, the heavy mineral analysis and the measurement of roundness of rourndnest of the sand grains of Niigata Sand Dunes indicate that there are some differences of their results among the Recent Dunes I, II and III, and also that there is some regional variation within each row of these dunes. We considered the process of the formation of the Recent Dunes I, II and III in the light of these facts as well as the topographical features of the dunes which we had already reported. It is believed that the sand which was supplied by the Shinano River and the Agano River played the most important role in the formation of Niigata Sand Dunes.