PRELIMINARY STUDY ON THE DESERT -LOESS DEPOSIT GROUP IN THE NORTH SHELF AREA AT THE CLOSE OF LATE PLEISTOCENE

At the close of Late Pleistocene,as a result of strong monsoon action,the desert loess deposit group was formed in western China(loess plateau and the desert region to its west).With its arrival in the shelf areas,two new desert-loess deposit groups were formed.One is the Bohai Sea desert-loess deposit group,including the floor of Bohai Sea and the desert zone along the coast and the loess deposits containing foraminifera distributed in the western coast of Liaodong Peninsula,the Miaodao Islands,and to the west of Penglai City,Shandong Province,the other is the Yellow Sea desert loess group,including the desert area in the North Jiangsu shoal and Yangtze River delta region prior to Holocene transgression and the Xiashu loess in the vicinity of Nanjing City.