沟牙系

词组短语

holcodont dentition

与沟牙系相关的网络例句 [注：此内容来源于网络，仅供参考]

With the thesis and research content above,we make the systemic stratigraphic division and correlation for each section of Majiagou group in research area with the conodont combination and its zoning features、division of international Ordovician and the partition method before.

从研究区的实际出发，结合牙形剌古生物组合面貌及分带特征，对研究区奥陶系马家沟组各段地层进行了系统对比厘定。