A system of the Lower Archaean, extending from about 3800 Ma to about 3500 Ma ago, and named from the Isuan supercrustal rocks of western Greenland that include the Amitsôq gneisses.
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。