古生代(Palaeozoic Era)：意为古老生物的时代。 寒武纪(Cambrian Period)：因首先在英国威尔士的 Cambria 研究了这一时代的地层 而得名。
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My professor studies flora of the Palaeozoic Era.
我的教授研究古生代的植物群。
Like the Palaeozoic Era, the Mesozoic Era has been divided into smaller units of geological time called period.
如同古生代一样，中生代也可划分成一些叫纪的较小的时间单位。
The basement strata and the migmatite, however, were formed much later, about Cambrian period and early palaeozoic era.
但其基底地层和混合岩形成时代较晚，为寒武纪和下古生代。
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