Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.

岩层中有证据表明，该地区在15,000年前曾经非常干旱。

柯林斯例句

To expose ( rock strata ) by erosion.

剥蚀因腐蚀而露出 ( 石层 )

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This is because of formed by soft - hard rock strata combined under tectonic stress action.

这种结果是由软硬相同的岩层组合在构造应力作用下形成的.

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