A Proterozoic phase of mountain building, which ended about 1750–1800 Ma ago, and that affected the shield area in what is now Canada. It was preceded by the Kenoran and succeeded by the Grenvillian orogenies.
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。