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一、自然环境概况通榆县位于吉林省西部,总面积为8047平方公里。自中生代以来以持续沉降为主,堆积了巨厚的中生代地层,并受北北东向构造控制,使东西两侧在沉降幅度、古地理环境、沉积物厚度和现代地貌景观都显示出较大的差异性。其东部沉降幅度小称高平原(或台地),西部沉降幅度大称低平原。通榆县位于沉降幅度较大的低平原的西部
First, the natural environment Tongyu County is located in the western part of Jilin Province, with a total area of 8047 square kilometers. Since the Mesozoic, with continuous subsidence, the Jurassic thick Mesozoic strata have accumulated and are controlled by the north-north eastward tectonics, which make the east and west sides show greater amplitude of sedimentation, palaeogeomorphology, sediment thickness and modern landscape The difference. The eastern subsidence range of small plains (or terraces), the western subsidence range of low plains. Tongyu County is located in the western part of the low-lying area where the settlement has been greatly reduced