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一般说来同时生存于某一地质时代的不同门类化石,从本质上讲只能指示同一地质时代。实际上,由于各类生物演化速率的差异,对同一地层采获的不同门类化石,有时也会产生矛盾现象。在青海柴达木盆地东北缘创名的城墙沟组就是一个例子。本文在回城顾墙沟组研究简史的同时,试图通过欧龙布鲁克山重新测制的比较完整的剖面(新层型),来讨论它的定义、时代和向外延展对比的问题,并探讨了它的上下接触关系和沉积的古地理格局。
In general, different types of fossils that exist simultaneously in a geological era can only indicate the same geological period in essence. In fact, due to the differences in the rate of evolution of various organisms, sometimes contradictions can sometimes arise in different types of fossils collected in the same strata. An example is the Chengzigou group, which is named after the northeast margin of Qaidam Basin in Qinghai Province. This paper attempts to discuss the definition, the epoch and the contrast of outward extension through the comparative study of Guzigou Formation in the city and the comparatively complete section It discusses its up and down contact relationship and depositional paleogeography.