近畿北部の内陸盆地に関する地質学的諸問題

概要

論文の詳細を見る
The Middle Gravels of the Osaka Group exposed in Kyoto and Nara basins are described, The Higher Terrace depositsin some areas of Kinki District are also described, and the new viewpoint for the deposits is presented. And the development of basins and geography of Northern Kinki is discussed mainly concerning with those ages. The inner basins in Northern Kinki, which have been undergone no postglacial transgression, have the geohistory since early Pleistocene. Many depressions shown by the Middle Gravels occured, and the lacustrine basins expanded its territory into maximum in the age of the Yellow Tuff (1.3×10^6 yr). Successively, transgression invaded some of basins with sea water. In the age of the Azuki tuff (8.7×10^5 yr), Lake Biwa-Osaka Bay active depressional zone came into distinct, and simultaneously small basins originated in Tamba mountainland, namely, Kameoka, Fukuchiyama, Ayabe Basins and so on. And afterward, the active depressional basins initiated in the former larger basins at the age of Higher Terrace.
日本地質学会の論文
1977-02-21