从剖面上部去掉最年轻的层，使下伏的岩层恢复到原始的、未被扰动的状态。
Removal of the youngest layers of rock at the top of the section allows restoration of the underlying layers to their initial, undisturbed configurations.
剖面的下部常见生物扰动现象。
In the lower part of the section bioturbation is a common feature.
剖面的下部常见生物扰动现象。
In the lower part of the section bioturbation is a common feature.
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