寒武紀
寒武紀者（符：Є），地質年代也。顯生宙之始，迄今五億四千二百萬年前，至四億八千八百萬年。
寒武紀者，顯生宙之首，奧陶紀次之。
概要
迄今已久，其地貌幾不可考。只知有一大陸，細者亦有數。動物皆以水為居。天地日暖，海面日漲而沒低地，利及百昌新生。始有硬殼動物，易成僵石，故其駭甚多矣。
紀初，生命突增，進化神速，盈於大洋。此謂寒武紀大爆發矣。
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