A stage (340–333 Ma ago) in the Middle Mississippian of N. America, underlain by the Osagean, overlain by the Chesterian, and roughly contemporaneous with the Arundian, Holkerian, and Asbian stages of the Visean series of Europe.
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。