Geological Significance of the Climatic Geomorphies of Late Pleistocene in North China
Yuan Baoyin (Institute of Geology, Academia Sinica)
North China applies the region where is situated north of the line from Mt. Kun-lun, Mt. Qinling to the Huaihe River. The climatic zones in North China as well as the megageomorphies appear obvious changes from northwest to south-east. This area is located in the middle latitudes, so it is highly sensitive region to globle climatic variations. When the climatic changes happented in Quaternary the climatic zones and climatic geomorphy types in each zone occured appropriate changes. Various ancient climatic geomorphies were remained in different climatic zones. While discussing the development and movement of the climatic geomorphies of late Pleistocene in North China, the history of climatic changes has been reconstructed in this paper. Three main climatic stages were edentified and they were named after local names. They are f ollowings:1. Salawusu temperate-wet stage, 50,000-25,000 year B. P.2. Chaerhan dry-cold stage, 25,000-10,000 year B. P.3. Dagouwan temperate-wet stage, 10,000 year B. P.-present. Recent climate tend to change to more dry and cold.