They can be contrasted with pre North, North, Atlantic and sub North strata in Europe.
可与欧洲前北方期、北方期和大西洋期、亚北方期进行对比。
2
On the basis of analyzing mechanical situation of floor strata of roadway driving along goaf in fully mechanized sub level caving face, a mechanical model was established.
在分析综放沿空掘巷底板力学环境的基础上，建立了底板力学分析模型。
3
The former was identicle with the age of adjacent strata in North China stratigraphicarea, which was conductive to regional stratigraphic sub-division and correlation;