A stage of the Middle Proterozoic, lasting from about 1400 to 800 Ma ago, that was preceded by the Animikian and followed by the Sinian. Russian usage extends the era to about 680 Ma ago.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。