A stage (7.5–2.9 Ma ago) in the Upper Neogene period of the west coast of N. America, underlain by the Mohnian, overlain by the Repettian, and roughly contemporaneous with the upper Messinian, Zanclean (Tabianian), and lower Piacenzian 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。