The basal Russian-Kazakhstan stage of the Cambrian period, underlain by the Nemakit–Daldynian, overlain by the Atdabanian, and dated at about 534–530 Ma ago. See also caerfai epoch.
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。