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沈家屯剖面位于松辽盆地东南部吉林省农安地区,富含孢粉化石,岩性以泥岩为主,夹粉砂岩,属于嫩江组三、四段。本文通过对沈家屯剖面孢粉化石的分析,识别出Aquilapollenites-Dictyotriletes-Rugubivesiculites,Schizaeoisporites-Classopollis-Beaupreaidites和Rugubivesiculites-Schizaeoisporites-Quercoidites三个孢粉组合,通过对孢粉化石属种的分析,得出本剖面孢粉组合的时代为Campanian期。对孢粉化石的定量分析表明,其总体上反映了一种半湿润的中亚热带气候面貌,气候波动较小。
The section of Shenjiatun is located in the Nong’an area, Jilin Province, southeast of the Songliao Basin. It is rich in sporopollen fossils. The lithology is dominated by mudstone and siltstone, which belongs to the third and fourth sections of Nenjiang Formation. Based on the analysis of sporo-pollen fossils in the section of Shenjiadun, three cross-pollen assemblages of Aquilapollenites-Dictyotriletes-Rugubivesiculites, Schizaeoisporites-Classopollis-Beaupreaidites and Rugubivesiculites-Schizaeoisporites-Quercoidites were identified. The age of the sporopollen assemblage is the Campanian period. Quantitative analysis of sporo-pollen fossils shows that it generally reflects a sub-humid subtropical climate with less fluctuation.