A stage of the Middle–Upper Proterozoic, from about 1600–650 Ma ago, and equivalent to the Jotnian (Van Eysinga, 1975). The name is not used in the 2004 revised timescale of the Int. Commission on Stratigraphy.
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。