A Californian stage (51–48 Ma ago) in the Eocene, underlain by the Penutian, overlain by the Narizian, and roughly contemporaneous with the upper Ypresian and lower Lutetian stages.
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。