这一动物群的更替事件受到当时沉积环境变迁和区域构造活动的制约。
This fauna replacement event was under the control of the variations of sedimentary environments and regional tectonic activities.
相关研究表明，盆地深部和浅部的铀异常具有一定的关系，盆地历经的沉积环境变迁是铀元素富集的主导因素。
The activation and accumulation aroused the abnormity of natural gamma. There is a certain correlation in shallow and deep abnormality of uranium.
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