A comparative analysis of ancient sedimentary rock formations revealed that the mass disappearance of prehistoric fauna was caused by multiple volcanic eruptions.

对古代沉积岩的对比分析表明，大量史前动物的消失是由多次火山爆发造成的。

As Lyell has well remarked, the extent and thickness of our sedimentary formations are the result and the measure of the denudation which the earth's crust has elsewhere undergone.

正如莱尔所说的那样， 我们沉积岩层的范围和厚度是地壳在其他地方经历的剥蚀的结果和衡量标准。