Identification of Geological Time of Mesozoic Strata in
This paper established new stratigraphical sequences based on seismic sequences, in combination of the evidence from biostratigraphy and lithology and regional tectonic movements. The following are proposed: 1) the Middle Jurassic Zhougongshan Formation and Yuantongshan Formation are classified to Yuantongshan Formation due to their similar lithological, geophysical and palaeontological features, which could be respectively taken as the upper and lower parts of Yuantongshan Formation; 2) the Zhuxiang Formation and Heishidu Formation are contemporaneous different facies in different places, and are in the Upper Jurassic stratum; 3) the Xiangdaopu Formation is the stratum of the Lower Cretaceous; and 4) the Dingyuan Formation and Qijiaqiao Formation are contemporaneous different facies in different places, and are in the Tertiary stratum.