The final stage (260.4–251 Ma ago) in the Late Permian of N. America, underlain by the Guadalupian, overlain by the Triassic (see scythian), and roughly contemporaneous with the upper Kazanian and Changhsingian 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。