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东北地区是中国境内中生界发育较完整的地区之一,其中三叠系在内蒙古二连盆地东北部发育较好,侏罗系发育较完整的剖面分布于冀北、辽西及二连盆地,下白垩统以二连盆地和辽西地区发育齐全且研究程度较高,上白垩统以松辽盆地发育最佳,研究程度最高。以东北地区中生界作为研究载体,对中生代孢粉化石群加以清理,共整理出29个孢粉化石组合。经研究认为,东北地区中生代古气候背景经历了2个超级周期、4个一级周期,以及12个二级气候变化周期。
Northeast China is one of the more developed regions of Mesozoic in China. The Triassic developed well in the northeastern Erlian Basin, Inner Mongolia. The more developed sections of the Jurassic are located in the northern Hebei, western Liaoning and Erlian basins, The Lower Cretaceous is well developed and highly studied in the Erlian Basin and western Liaoning. The Upper Cretaceous was developed best in the Songliao Basin with the highest degree of research. Taking the Mesozoic in northeastern China as a research carrier, the Mesozoic sporo-pollen fossils were cleaned up and 29 sporo-pollen assemblages were sorted out. The study suggests that the Mesozoic paleoclimate background in Northeast China experienced two super cycles, four first-level cycles, and twelve second-level climate change cycles.