The Tertiary strata belong to soft rock.
第三系岩层属中软岩。
In the regional stratigraphic classification and correlation, the Lower Tertiary strata are absent in Guyang basin, Inner Mongolia.
在区域地层划分与对比中，内蒙古固阳盆地缺少下第三系。
Diagenetic time of upper Tertiary strata in Xixiayuan engineering is short, and the rock and soil exist at the same time, which is transitional strata between rock and soil.
西霞院工程上第三系地层成岩时间短，岩、土性质并存，是介于岩石与土之间的过渡性地层。
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