A compacted, non-fissile, fine-grained, sedimentary rock composed predominantly of clay-sized (less than 4 μm grain size) particles. Compare mudstone.
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。