Abstract: There are,from the lower to the upper,Laohutai.Lizigou,Guchengzi,Jijuntun,Xilutian and Gengjiajie formation in the lower Tertiary of Fushun Basin.Gengjiajie formation is the Upper strata and was formerly considered as either Eocene or Oligocene due to the lack of fossils.Having studied the sporo-pollen fossils in Genjiajie formation,it is suggested that the Assemblage of Sporo-pollen in the Genjiajie formation should belong to the high content zone of Quercoidites of the Eocene Sporo-pollen Assemblage and do not belong to the high content zone of Ulmipollenites of the Oligocene Sporo-pollen Assemblage in the North-East China.The Geological age of the Gengjiajie formation is considered as Eocene.

摘要： 耿家街组是抚顺盆地下第三系最上部地层,因建组时未发现化石,致使其时代有始新世、渐新世之争.本文通过对耿家街组所含孢粉化石的研究,认为耿家街组孢粉组合是东北地区始新世孢粉组合的一部分.指出耿家街组开始沉积于西露天组中上部沉积之时,是当时抚顺古湖中湖水较深部分的产物,其时代为始新世.

关键词: 抚顺, 断陷盆地, 耿家街组, 孢粉组合, 化石生物地层对比, 地层年代单位, 沉积环境