Division of the fundamental unit (zone) used in biostratigraphy. The demarcation of a subzone is based on the fossil subspecies or assemblage contained within the rock sequence studied.
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。