北京延庆盆地第四纪早期介形类动物群、古生态及对该区古环境的认识

据延庆杨户庄等剖面的介形类化石，结合孢粉、有孔虫及延庆盆地的古地磁资料，确定含化石地层为下更新统。通过剖面下部产出的海相介形类、咸水介形美、有孔虫及剖面上部含的有孔虫、咸水介形类、轮藻等化石古生态的分析，认为延庆盆地在早更新世曾通过河道与海洋相通。推断有２个可能的通道：（１）吉永定河、桑干河、妫水河等河流；（２）经过八达岭、军都山的河流．笔者从地层对比确认新构造运动十分强烈．八达岭、军都山等山峦可能是早更新世以来逐渐升高形成的．

OSTRACODS AND PALAEOECOLOGIC RECORD OF YANQING BASIN,BEIJING,FOR EARLY QUATENARY:IMPLICATIONS FOR ITS PALAEOTECTONIC ENVIRONMENT

Abstract Based on the studies of ostracods, sporepollens and foraminifera collected in the stratigraphic sequences in Yanghuzhuang village and the nearby areasof YanqingBasin, coupled with the detu about its polaeomapnetic documents, it was susgested that the fossil rich sequences be dated Early Pleistocene Period. In addition to the suggestion, the animal fossils crowding within the lower perts of the sequences such as foraminifera, marine ostracods and salt water ostracods also provided evidence for the basin to have been channeled with open sea via two passways, one including rivers of ancient Yongdinhe, Sangganhe and Guishuihe, and the other representing those flowing through ranges of Badaling and Jundushan ranges. Finally,systematically stratigraphic correlation gave emphasis on there being strongneotectonic activities in the basin, most possibly, from Early Pleistocene time,causing the above-mentioned two ranges to progressively uplift.