It has been found that the cretaceous system is widely distributed in Liupanshan region including Sanqiao Fm, Heshangpu Fm, Madongshan Fm, and Naijiahe Fm.

• 发现宁夏六盘山地区白垩纪地层广泛发育，自下而上划分为三桥组、和尚铺组、李洼峡组、马东山组、乃家河组；从沉积特征、地层层序、沉积相表明。