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合山煤田主采煤层底板发现古土壤层，在煤分层之间又发现稳定的陆相根土层，结合煤本身的微量元素含量分析，并与现代咸水植物及现代淡水植物的微量元素含量对比，对这种夹在海相碳酸盐岩中的煤层的成因有了新的认识。作者认为，主采煤层与其间接底板碳酸盐岩间存在沉积间断；合山组含煤岩系中可见规模极小的孤立的海绵小礁块，这些都是碳酸盐台地表面浅水环境常见的特征。分析黔桂两省大面积古地理背景，作者认为，合山煤田主采煤层形成于碳酸盐台地表面废弃潮坪上发育的泥炭沼泽，少数地段则是在碳酸盐台地表面闭塞水体进一步沼泽化的条件下形成的。
The ancient soil layer was found in the coal seam floor of the main coal seam of Heshan Coalfield. A stable terrestrial rhizosphere soil was found between coal strata. Combining with the analysis of trace elements in coal itself, the content of trace elements in modern salt water plants and modern freshwater plants In contrast, there is a new understanding of the genesis of this type of coal seam trapped in marine carbonates. The authors believe there is a discontinuity of sedimentation between the main coal seam and its indirect basement carbonate rocks; isolated small spongy reefs are visible in the coal-bearing series of the Heshan Formation, all of which are common in carbonate platform surface shallow water environments Characteristics. After analyzing the paleogeographic background of Guizhou and Guangxi provinces, the authors believe that the main coal seam of Heshan coalfield is formed on the abandoned tidal flat peat swamp on the surface of carbonate platform, while in a few areas the water is occluded on the surface of carbonate platform Formed under swamp conditions.