The formation is mainly composed of variegated quartz sandstone, garnet quartz sandstone, and minor silty pelite, conglomerate and marble. It is over 650m in total thickness and can be divided into five lithologic members in ascending order.

• 它主要由杂色的石英砂岩、石榴子石石英砂岩组成；还有少量粉砂质泥岩、砾岩和大理岩；总厚度大于650m；自下而上可分五个岩性段.