A stage (359.2–348 Ma ago) in the Mississippian epoch of N. America, underlain by the Famennian, overlain by the Osagean, and containing the Hastarian regional stage.
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。