【摘要】 哈密拗陷北部下侏罗统按其岩性、化石组合和地震波组等特征自下而上分为八道湾组和三工河组。根据两组所产的孢粉化石,建立了两个孢粉组合:OsmundaciditesApiculatisporisCycadopites组合和CyathiditesPinuspollenitesCycadopites组合。根据孢粉组合特征及其对比,探讨了八道湾组和三工河组的地质时代。更多还原

【Abstract】 On the basis of the lithology, fossil assemblages and seismic wave groups, the Lower Jurassic in the northern Hami depression may be in ascending order into the Badaowan Formation and Sangonghe Formation.According the sporopollen fossils,two sporopollen assemblages are recognized:the Osmundacidites-Apiculatisporis-Cycadopites assemblage and Cyathidites-Pinuspollenites-Cycadopites assemblage.According the characteristics and correlation of the sporopollen assemblages,the authors discuss the ages of the Badaowan Formation and Sangonghe Formation.更多还原