The processes that are both artificial denudation and artificial accumulation to original geomorphy were uninterrupted, and original geomorphy was eroded by floodwater.
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.
各种土料堆筑而成,它们
抵御洪水突袭时,常有渗
险情发生而使人措手不及。
所说
那样， 我们沉积岩层
围和厚度是地壳在其他地方
