geological period

A series of discoveries and studies on ancient life forms in the20th century demonstrated that Cambrian was a geological period full of the wildest imagination.

20世纪古生物的一系列发现和研究，证明了寒武纪是一个最能激发人们想象力的地质时代。

during the geological period of loess plateau, the relatively intensive stages of soil erosion included five stages: early period ( 2.5~ 2.4 ma b.p.)

黄土高原地质时期土壤侵蚀的相对强烈期为：更新世早期（2.5～2.4MaB.P.）

During this geological period of long-term reduction in the temperature of the Earth's surface and atmosphere, the weight of ice sheets was so great that they deformed the Earth's crust and mantle, causing it to bulge at the middle.

在这一地质时期过程中，地球的表面以及大气层的温度都在降低，冰原冰川的重量如此之大，以至于迫使地壳和地幔发生了变形，使得两者中部发生了隆起。