The alabandite and getchellite of hydrothermal origin, cement anatase of alkaline volcanic origin, and the high content of chlorite in coal were fist found in coals.

在西南地区晚二叠世煤中首次发现了热的矿和矿、碱性火山灰的胶态锐钛矿和陆源碎屑的斜绿泥石。