SEA LEVEL CHANGES AND HYDRO-ISOSTASY EFFECT THEORY DURING LATE QUATERNARY, IN THE VIEW OF FIELD EXCAVATING SURVEYS

等深线效应理论是解决晚第四纪海平面变化历史的一条新途径。在北海道东部和九州西部的沿海沼泽和泻湖进行了实地挖掘调查，以检查它是否适应日本周围的海平面变化。通过对采集的样品进行岩相描述、微化石分析和碳-14测定，推测了它们的沉积环境和沉积年代，研究表明，北海道东部地区在2500年前经历了低海平面阶段，在1000年前经历了高海平面阶段。因为这些海平面变化与九州大学中田教授的理论计算模型不相符。我们发现了一个改进理论的新方法。在九州西部，发现6000年前的海平面低于中田模型所推测的伊沙亚地区的现在海平面。

Hydro-isostasy effect theory is a new key to solve a sea level change history during Late Quaternary. Field excavating surveys were done at the coastal marshes and lagoons in the east part of Hokkaido, and in the west part of Kyushu, to examine it to adapt the sea level changes around Japan. We brought the samples taken by the surveys to describe their Lithofaceies, and to presume their sedimentary environments by micro-fossil analyzes, and their sedimentary ages by a carbon-14method.Our research shows that the low sea level stage at about 2500 years ago, and high sea level stage at 1000 years had occurred in the east part of Hokkaido. Because these sea level changes were not fitted with the theoretical calculation model by Prof. Nakata, Kyushu University. We found a new key to improve the theory. In west part of Kyushu, the sea level at 6000 years ago was found below the present sea level at Isahaya area that had been presumed by the Nakata's model.