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本文简要介绍了裂变径迹测年法原理，并利用该方法测定了汤原断陷下第三系达连河组至宝泉岭组段的碎屑沉积岩的地质年龄。并重新厘定了本区下第三系达连河组与宝泉岭组的地质界线。
In this paper, the principle of fission track dating method is briefly introduced, and the geologic age of clastic sedimentary rocks from Da Lianhe Formation to Baoquanling Formation in Tangyuan Depression is measured by this method. And re-determine the area under the Tertiary Daruianhe Baoquanling Formation and geological boundaries.