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发育在晚二叠世合山组主采４煤层及其分层底板的硅质岩含有大量的海绵骨针，向陆过渡为黑色泥岩或具根化石的铝土质粘土岩，向海则相变为燧石灰岩，这种海绵骨针硅质岩为原生沉积成因。在沼泽化过程中，炎热潮湿的气候及繁盛的植物使原先的沉积岩发生强烈的化学风化作用，由此产生的胶状ＳｉＯ２随地表水进入滨岸地带，与海水中带有正电荷的电解质发生化学反应，沉淀下来。而富含ＳｉＯ２的海水及极少陆源碎屑供给又为硅质海绵的生存提供了必要条件。向陆、向海海绵骨针岩的缺失说明海绵群只生活在海岸线附近。因此，这些发育在主采４煤层及其分层底板的海绵骨针硅质岩可大致反映研究区当时沉积水体的岸线位置。
The siliceous rocks developed mainly in the Lower Permian Heshan Formation, the No.4 coal seam and its layered basement contain a large number of sponge spicules, transition to black mudstone or bauxite clay with fossil roots, and phase change to the sea For the flint limestone, this sponge spinel silicalite is a primary sedimentary genesis. In the process of swamping, hot and humid climates and thriving plants cause strong chemical weathering of the original sedimentary rocks. The resulting gummy SiO2 enters the coastal zone along with the surface water and interacts positively with the electrolytes in seawater Chemical reaction, precipitation. The supply of seawater rich in SiO2 and little terrigenous debris provided the necessary conditions for the survival of siliceous sponges. The loss of Xianghai and Xianghai sponge bone rock indicates that the sponge group only lived near the coastline. Therefore, these sponge spinel siliceous rocks, which developed in the main coal seam 4 and its stratified floor, generally reflect the shoreline position of the sedimentary bodies at that time in the study area.