奥陶世也就是奥陶纪(Ordovician Period,Ordovician,符号O),地质年代名称,是古生代的第二个纪(原始的脊椎动物出现),开始于距今5亿年,延续了6500万年。奥陶纪开始于同位素年龄488.3±1.7Ma(Million Anniversary,百万年、),结束于443.7±1.5Ma。
中奥陶世 Middle Ordovician ; Llanvirn
晚奥陶世 [地质] late ordovician epoch ; [地质] upper ordovician
早奥陶世 [地质] Lower Ordovician ; early ordovician
中奥陶世前的 premedial Ordovician
中奥陶世末 end of middle ordovician period
晚奥陶世太康造山运动 taconic orogeny
旱奥陶世晚期 arenigian stage
中晚奥陶世 Middle-Late Ordovician
中及晚奥陶世 middle and late ordovician
早奥陶世地层 Early Ordovician strata
这是晚奥陶世晚期大规模海退的结果。
This was the result from the large-scale regression in the Late Ordovician.
纸房地区具有早奥陶世海相火山岩存在。
Marine volcanics of Early Ordovician was found in Zhifang region.
这种定量的岩相古地理图在我国南方中及晚奥陶世还是首次出现。
This is the first time in the study and mapping of the Middle and Late Ordovician in South China.
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