晚第三系是云南主要的含煤地层之一,分布在许多大小不等的山间盆地中,具有一般陆相山间盆地沉积的特点,其含煤盆地的大小、聚煤的规模、含煤地层的厚度和含煤情况等方面,变化都很大。晚第三纪煤的煤种,绝大部分为褐煤,其变质程度也不一致。除少数矿区含有比较稳定的厚煤层外,多数矿区煤层的层数和厚度变化较大,结构比较复杂, Late Tertiary is one of the main coal-bearing strata in Yunnan, distributed in many mountain basins of different sizes and has the characteristics of general continental facies basin deposits. The size of the coal-bearing basins, the scale of coal accumulations, the coal-bearing strata The thickness and coal content and other aspects, the changes are great. Late Tertiary coal coal, the vast majority of lignite, the degree of deterioration is also inconsistent. Except for a few mines containing relatively stable thick coal seams, the number and thickness of the coal seams in most of the mined areas vary greatly and the structure is relatively complicated.