Era palaeozoic

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。

My professor studies flora of the Palaeozoic Era.

我的教授研究古生代的植物群。

During Palaeozoic era and Triassic period, Taikang area received Marine, continental-marine transition, and continental sediments, then uplifted in the end of Triassic and was denuded widely.

太康地区古生代至三叠纪接受了海相、海陆过渡相和陆相盆地沉积，三叠纪末隆起，地层广遭剥蚀。