The middle part of the Proterozoic, lasting from about 1600–1000 Ma ago.
http://www.palaeos.org/Mesoproterozoic The Mesoproterozoic Era of the Proterozoic Eon.
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。