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震旦纪“震旦”原是古代印度人对中国的称谓,德国地质学家李希霍芬1882年用来代表地层系统,此时代形成的地层叫“震旦系”。寒武纪“寒武”一名,来自英国西部成尔土地方的寒武山区,1883年英国地质学家薛知微首先在此研究本纪地层,并将此时期之地层命名以寒武系。奥陶纪“奥陶”一名是1878年英国拉普华斯所提出,代表早古生代第三个纪时海水漫漫、浅海广布、生物最为繁盛的时期。“奥陶”本为成尔士地区在罗马占领时的民族名,被引用来作地质时代及地层名。
Sinian “Aurora” is the ancient Indians on China’s title, the German geologist Rexhivin 1882 to represent the stratigraphic system, the formation of this era called the “Sinian”. Cambrian “” Cambrian “, from the British landlocked landform Cambrian mountainous region, in 1883 British geologist Xue Zhwei first studied in this discipline stratigraphy, and the strata of this period named the Cambrian. Ordovician ”Ordovician “ One is proposed by the British Laporte in 1878, on behalf of the third period of the Early Paleozoic sea water is long, wide-spread, biological most prosperous period. ”Ordovician " This is the national name of the Cersei region occupied by Rome, is quoted for geological age and stratigraphic name.