Sandstone beds of the Luohe Formation thin from the margin to the center of the basin.Sediments in the Huanhe-Huachi Formation coarsen to the north and to the east.

• 沉积特征受构造运动影响和沉积相带控制，洛河组是从山缘向盆地内砂岩厚度迅速变薄、尖灭；