请输入您要查询的字词:

 

单词 Oppel zone
释义
Oppel zone

Geology and Earth Sciences
  • A concurrent range zone as originally conceived by Albert Oppel. The lower boundary of the zone is usually determined by the first appearance of one diagnostic taxon and the upper boundary by the last appearance of another (either might extend above or below into a region of overlap with the other taxon at the upper or lower end of their range). Other characteristic taxa may be contained within the zone or extend to either side, although long-ranging and slowly evolving lineages are not usually included in the diagnostic assemblage. Not all the significant taxa are required to be present at all levels and in all places. The zone is named after one of the diagnostic species. Oppel zones are thus more flexible and subjective than concurrent range zones in the rigorously applied sense of that term, although the term ‘concurrent range zone’ is commonly used for what is, in fact, an Oppel zone.


随便看

 

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。

 

Copyright © 2000-2023 Sciref.net All Rights Reserved
京ICP备2021023879号 更新时间:2024/12/25 1:43:43