Correct

古生代

/ gǔshēngdài / 
Strokes

Definition

Paleozoic, geological era 545-250m years ago, covering Cambrian 寒武纪, Ordovician 奥陶纪, Silurian 志留纪, Devonian 泥盆纪, Carboniferous 石炭纪, Permian 二叠纪

Example

As a Noun

Palaeozoic Era