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天山两侧前陆盆地晚新生代地层发育，沉积厚度较大。盆地沉积序列的韵律性反映了天山造 山带的构造演化历史。晚新生代沉积特征及抱粉组合表明，中新世—上新世—早更新世碎屑岩不稳 定组分明显增加，阔叶植物花粉含量减少、耐干喜旱的篙、藜等显著增加，反映天山活动性增强，上新 世晚期天山强烈隆升，天山两侧前陆盆地上新世晚期开始出现磨拉石建造，由于山体隆升造成的大 气环流改变，天山两侧盆地封闭性增强，大陆性气候明显，气候发生较显著变化。
The Late Cenozoic stratigraphy of the foreland basins on both sides of Tianshan Mountains developed with larger sedimentary thickness. The rhythm of the sedimentary sequence of the basin reflects the tectonic evolution history of the Tianshan orogenic belt. The Late Cenozoic sedimentary characteristics and clayey assemblage indicate that the Miocene-Pliocene-Early Pleistocene clastic rock instability increased significantly, the broad-leaved plants reduced their pollen content, , Reflecting the enhanced activity of the Tianshan Mountains and the strong uplift of the Tianshan Mountains in the late Pliocene. The molasse began to appear in the Late Pliocene of the Tianshan Mountains, and the closure of the basins on both sides of the Tianshan Mountains was enhanced due to the changes in the atmospheric circulation caused by the uplift of the mountains , The continental climate is obvious, the climate has changed significantly.