from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Adjective:
formed in the later of two divisions of the Precambrian era;
"proterozoic life forms"
双语例句
1. Wangjiawaizi gold deposit occurs in Lower Proterozoic opimetamorphic rock series.
王家崴子金矿床赋存于辽南古元古代浅变质岩系中.
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2. GLOBAL DISTRIBUTION OF THE PROTEROZOIC SPHAEROMORPH ACRITARCH Valeria lophostriata ( JANKAUSKAS )
元古代光球疑源类Valerialophostriata ( Jank. )的全球分布(英文 )
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3. The Proterozoic and Palaeozoic are two main metallogenic periods in the region.
西北地区以元古宙-古生代金属成矿为显著特色.
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4. Probably formed in Early Proterozoic, it was rejuvenated repeatedly in late stage.
其形成时间可能为早元古代, 后期又有多次复活.
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5. There are Middle | Lower Devonian Sanhuokou Group and Middle | Upper Proterozoic Bikou Group in the ore district.
矿区出露中下泥盆统三河口群和中上元古界碧口群.
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用作名词 (n.)
Early Proterozoic high-pressure metamorphism in the Wutaishan. 五台山早元古代高压变质作用研究。
Wangjiawaizi gold deposit occurrs in Lower Proterozoic opimetamorphic rock series. 王家崴子金矿床赋存于辽南古元古代浅变质岩系中。
用作形容词 (adj.)
Boron deposits of eastern Liaoning occur in a suite of Early Proterozoic metamorphic rocks, with boron orebodies existent in magnesian marble. 辽东硼矿床产于早元古代的一套变质岩内，硼矿体赋存于镁质大理岩中。
