A stage (460.9–459 Ma ago) of the Ordovician in the Lower Caradoc, preceded by the Darriwilian and overlain by the Harnagian.
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。