Microfossil analysis reveals three transgression layers in the CQJ4 borehole, which are at 4.
微体生物分析显示该孔岩芯记录了三个海侵层，分别位于4。
2
This achievement provides the microfossil materials for the study of the lower ordovician in Northern Guizhou.
这一成果对于贵州北部下奥陶统的研究，提供了微体化石资料。
3
The sea level changes of Holocene in Shanghai region are discussed in this paper based on the spore - pollen and microfossil analysis of Zhaoxiang core.