埼玉県寿能泥炭層遺跡の概況と自然環境に関する2・3の問題

抄録

The Juno Peaty Site is situated on the Shibakawa lowland in the eastern part of Omiya City, Saitama Prefecture, and was investigated on the field from 1977 to 1981. The investigation was conducted to examine the natural environment of this site by the cooporation of archaeologist, geologist and many biologists. As the results, archaeological remains were found abundantly and useful observations were carried out, and many samples for scientific analysis were obtained to reconstruct the Juno's natural environment.
This paper deals with a summary of the Juno Peaty Site with mainly geological evidences and several points of the problem to reconstruct of natural environment of this site. Especially, height and age of the highest sea level on the Holocene Transgression (Jomon Transgression) and palaeovegetation in the Jomon Age are described.
Rising of sea level of Jomon Transgression in this site stagnated temporarily in the Kurohama stage (ca. 5, 700y.B.P.) showh by Kurohama Sand Bed with wave cut platform and trace fossils at 1m height on recent sea level, and thereafter, more risen sea level reached ca. 3m height on recent sea level in Moroiso-a stage. This 3m height indicates a upper limit of marine deposit in the highest sea level stage. Therefore it is presumedthat the highest sea level of Jomon Transgression stay on 3m height or more in the Moroisoa stage (ca. 5, 300y.B.P.) of Early Jomon Age.
On the palaeovegetation in Jomon Age it is thought generally that the laurel forest (Cyclobalanopsis) had covered on the Pacific coast of Japan from Early Jomon Age downward. In the site, however, it was found out that the deciduous broad-leaved forest (Lepidobalanus) was dominant during the Jomon Age. This aspect is in contrast with the viewpoint that the laurel forest covered on the area of the Pacific coast in Japan, and it is characteristic feature found over the central part of Kanto Plain.