论文部分内容阅读
根据华北盆地南部周参13等井的孢粉化石资料，建立了三个孢粉组合、五个亚组合。论述了它们的地质时代，进而确定了二叠系下统与二叠系上统的界限。
According to the sporopollen fossil data of Well 13 in the southern part of North China Basin, three sporopollen assemblages and five sub-assemblages were established. Discussed their geological age, and then determine the Permian and Permian system of the upper limit.