Abstract:

The Cretaceous microfossils in the Songliao Basin are characterized by abundance,wide-spreading and rapid evolution. Ostracods could be divided into 15 assemblage zones,sporo-pollen 5 assemblage zones, charophytes 4 assemblage zones. Some of the assemblage zones bear certain correspodent relationship to seismic wave groups, and could be used as the basis for stratigraphic division and correlation. The correspondences may be divided into two kinds:1. as boundary surfaces of series such as T₄¹, T₃¹ and T₃¹ wave groups which are related to tectonic movement, and coincided with the evolution of organisms, formation types and paleoclimates; 2. as lithologic revelation for example T₁ and T₂ wave groups are usually the standared reflective horizons for regional stratigraphic correlation.