Cambrian-Ordovician system 奥陶寒武系
cambrian ordovician system 奥陶寒武系
underlying ordovician system 下伏奥陶系
cambrian - ordovician system 奥陶寒武系
under-salt Ordovician system 盐下奥陶系
limestone of ordovician system 奥陶系灰岩
The coal, in Liyan mine can be divided to three clusters as fellow: upper, middle and lower. The coals in lower cluster contains limestone belong to Ordovician System.
里彦矿煤层可分为上、中、下三组,下组煤层下方赋存巨厚奥陶系灰岩,随着矿井向深部开采,底板灰岩突水将是危及该矿井安全生产的一大隐患。
参考来源 - 里彦矿灰岩水对下组煤安全开采影响的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
In north China, the thickness of Ordovician system is larger, the water-abundance is better.
华北地区奥陶系厚度大，富水性强。
A large amount of first hand data have been gained by the field investigation of the carbonate karst of the Ordovician system in the Xishan Hill of Beijing.
通过对北京西山奥陶系碳酸盐岩岩溶的野外调查，取得了大量的第一手资料。
There is a normal deposition sequence stratigraphy beneath the lower wall of over-thrust fault, such as Jurassic, Triassic, Permian-Carboniferous, Cambrian-Ordovician system.
在逆冲断裂的下盘，是一套正常沉积层序的地层，分别为侏罗系、三叠系、石炭—二叠系、寒武—奥陶系等地层。
应用推荐