the early palaeozoic 下古生界
the lower palaeozoic 下古生界
the upper palaeozoic 上古生界
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。
Part of the Palaeozoic ophiolites already determined in Xinjiang is obviously characterized by thermal emplacement.
在新疆已厘定的古生代蛇绿岩中，部分以热侵位为显著特征。
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