The coal-accumulating process of the lower Cretaceous ChanglingFormation was formed in a half graben of the NE trending fault zone which posited on theJinJatun Formation andesite.

• 下白垩统的长岭组聚煤作用形成于金家屯组安山岩上的北东向断陷带之中，聚煤盆地类型以半地堑式为主。