Three angular unconformities found in the field work in the previous Baishan Formation of the Carboniferous in Poziquan area help to subdivide Baishan Formation into four formations.

• 摘要通过野外工作，在前人所划的坡子泉地区石炭系白山组内新发现三个角度不整合，而将白山组解体成四个组。