... Middle Mississippian 中密西西比世 Middle Ordovician Epoch 中奥陶世 Middle Ordovician Series 中奥陶统 ...
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early middle ordovician 早中奥陶世
middle-ordovician 中奥陶世
Lower-Middle Ordovician 中下奥陶统
end of middle ordovician period 中奥陶世末
Cambrian-Middle Ordovician 寒武纪
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。
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。
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。
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