1·The main water source is fracture-karst water in Middle Ordovician carbonate rocks.
主要的供水水源为中奥陶统碳酸盐类岩石中的裂隙-喀斯特水。
2·Karst water from Middle Ordovician limestone can induce the most dangerous water hazards menacing mine safety.
中奥陶统灰岩岩溶水对煤矿安全威胁最大。
3·There are two important manganese carbonate horizons in the Middle Ordovician and Early Sinian strata in central Hunan Province.
湘中地区有中奥陶世和早震旦世两个重要的锰碳酸盐层。
4·That a: The Mn-deposits of Middle Ordovician Epoch in central Hunan were high grade Mn-ores with low-P, low-Fe and high basicity;
提出：①湘中地区中奥陶世锰矿是低磷、低铁、高碱度优质锰矿石；
5·The Guozhuang Spring exposed in the Middle Ordovician limestone is one of complete-drainage and of erosion structure of ascending type.
郭庄泉为一全排型、侵蚀—构造上升泉，出露于中奥陶纪灰岩中。
6·Trace fossils from the Middle Ordovician Lashizhong Formation in Zhuozishan, the northwest margin of Ordos Basin are studied systematically.
首次对鄂尔多斯盆地西北缘桌子山地区中奥陶世拉什仲组的遗迹化石进行了系统研究。
7·The material source of the Carboniferous karst type bauxite in North China mainly came from the underlying Late cambrian-middle Ordovician carbonate rock.
华北石炭纪岩溶型铝土矿的主要物质来源为下伏的晚寒武世—中奥陶世碳酸盐岩。
8·The reservoirs in Baota Formation of Middle Ordovician in South Sichuan are characterized by low porosity and low permeability and belong to a fractured type.
川南地区中奥陶统宝塔组储层具低孔低渗特征，属裂缝性储集类型。
9·Yijianfang formation of Middle Ordovician sedimentary period is the open platform of regional seawater shoaling with platform-inter-shallow patch reef sedimentary.
中奥陶统一间房组沉积时期为区域性的海水变浅的开阔台地台内浅滩夹点礁沉积。
10·From the suture line towards the north, an andesite line along Sharburti Mountain was the volcanic island arc developed from middle Ordovician to middle-late Silurian.
由缝合线向北，沙尔布尔提山安山岩线是中奥陶世至中、晚志留世发育起来的火山岛弧。