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\\\"
造句
用作名詞(n.)
Early Proterozoic high-pressure metamorphism in the Wutaishan. 五臺山早元古代高壓變質作用研究。
Wangjiawaizi gold deposit occurrs in Lower Proterozoic opimetamorphic rock series. 王家崴子金礦床賦存于遼南古元古代淺變質巖系中。
用作形容詞(adj.)
Boron deposits of eastern Liaoning occur in a suite of Early Proterozoic metamorphic rocks, with boron orebodies existent in magnesian marble. 遼東硼礦床產于早元古代的一套變質巖內，硼礦體賦存于鎂質大理巖中。