A Proterozoic phase of mountain building that occurred about 1500–1400 Ma ago, affecting what are now the Central and W. Nain Provinces of the Canadian Shield. It was preceded by the Hudsonian 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。