n.& adj.原生代（的）

proterozoic stratum → 元古代层
Proterozoic group → 元古界；原生界
Early Proterozoic → 早元古代；代早期
Proterozoic Eonothem → 元古宇
Proterozoic Erathem → 元古界
mid-Proterozoic ice age → 中原生代冰期
Middle-Upper Proterozoic → 中上元古界
Upper Proterozoic → 上元古界
late-proterozoic-cambrian → 元古宙末

1. Wangjiawaizi gold deposit occurs in Lower Proterozoic opimetamorphic rock series.
[汉]王家崴子金矿床赋存于辽南古元古代浅变质岩系中.
——来自互联网
2. GLOBAL DISTRIBUTION OF THE PROTEROZOIC SPHAEROMORPH ACRITARCH Valeria lophostriata ( JANKAUSKAS )
[汉]元古代光球疑源类Valerialophostriata ( Jank. )的全球分布(英文 )
——来自互联网
3. The Proterozoic and Palaeozoic are two main metallogenic periods in the region.
[汉]西北地区以元古宙-古生代金属成矿为显著特色.
——来自互联网
4. Probably formed in Early Proterozoic, it was rejuvenated repeatedly in late stage.
[汉]其形成时间可能为早元古代, 后期又有多次复活.
——来自互联网
5. There are Middle | Lower Devonian Sanhuokou Group and Middle | Upper Proterozoic Bikou Group in the ore district.
[汉]矿区出露中下泥盆统三河口群和中上元古界碧口群.
——来自互联网

【Adjective】

1. formed in the later of two divisions of the Precambrian era;
"proterozoic life forms"