The name given to the trilobite (Trilobita) and graptolite (Graptolithina) faunas characteristic of the northern and western margins of the Iapetus Ocean in the Early Palaeozoic. See also atlantic province.
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。