A Russian stage (306.5–306 Ma ago) in the Pennsylvanian epoch, preceded by the Myachkovskian (Moscovian stage) and followed by the Chamovnicheskian.
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。