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通过对西北地区侏罗纪孢粉学特征的研究，并结合岩石的物理属性，认为：中侏罗世晚期到晚侏罗世末存在一次最为明显的升温事件，其主要原因是由于侏罗纪全球性气温升高所导致；这次升温事件影响和改变了当时的成煤气候，并导致了早侏罗世－ 中侏罗世晚期聚煤作用的终止和消亡。
Based on the study of the palynological characteristics of the Jurassic in the northwestern China and the physical properties of the rocks, it is considered that there is one of the most obvious warming events at the end of the Middle Jurassic to the Late Jurassic, mainly due to the Jurassic Global warming caused by the temperature; this warming event affected and changed the coal formation climate at that time, and led to the termination and disappearance of early Jurassic-Middle Jurassic coal accumulation.