A lithostratigraphic term for coal-bearing rock strata of the Upper Carboniferous. The term is also used informally for coal-bearing strata of other ages (e.g. Permian in Australia).
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。