Abstract
In the case of the sandy coast of the Hibikinada, the west end of the mainland, I explicate in this report the process of the formation of bars and sand dunes mainly from the Archaeolo-geographic point of view.
1. The purposes of this report are as follows:
To correct the formative period of the diluvial old sand dunes.
To discover the bars formed by the Jomon transgression.
To add the data to infer the existence of little transgression of the middle of Yayoi age.
2. There are two pleistocene coastal sand dunes, one was formed before the Göttweiger interstadial. The other is Ayaragi old sand dune, which was before the Paudolf interstadial.
3. In Holocene bars piled at the transgressions of the earliest Jomon, the early Jomon, the first half of late Jomon, the middle Yayoi and the incipient stage of Heian age, and then exposed by each later regression.
Sand dunes were formed four times in Holocene; in the end of the earliest Jomon, in the second half of the late Jomon, from the end of the medieval ages to the middle of the modern ages and in the present age.
The first beach ridge was formed in the earliest Jomon, the second in the first half of late Jomon and the third in the incipient stage of Heian age. The new sand dune which give the topographical change is Tomito new sand dune, which was formed from the end of the medieval ages to the middle of the modern ages.
