“元古代”的拼音为：yuán gǔ dài...

成矿时代为中元古代早期.The mineralization epoch is the early period of mesoproterozoic Era.王家崴子金矿床赋存于辽南古元古代浅变质岩系中.Wangjiawaizi gold deposit occurs in Lower Proterozoic opimetamorphic rock series.元古代光球疑源类Valerialophostriata ( Jank. ...

“元古代”的英语可以翻译为：[地] Proterozoic era ...