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论述了类背景演化和演化事件的区别 ,确定了“茅口期”类辐射演化和绝灭高峰的层位 .研究结果表明 ,“茅口期”类动物群经历了 3次辐射演化和 4次绝灭高峰 .类动物的演化型式揭示 ,“茅口期”集群绝灭开始于“茅口中期” ,而集群绝灭的高潮则发生在“茅口晚期”
The differences between the evolutionary and evolutionary events of the iguanas and the stratigraphic evolution of the radiation and the extinction peaks of the 茅 period were identified.The results show that the fauna of the Maogou Period underwent three radiation evolutions And the extinction peak of 4. The evolutionary pattern of the species revealed that the extinction of the population of Maokou started in the middle stage of Maokou and the climax of the extinction of the cluster occurred in the late Maokou period