| Formation Name | Thickness/(m) | Lithology |
| Taiyuan Formation | 88 - 160 | limestone, dark gray (containing) bioclastic limestone and dark gray silty mudstone interbedded with thin carbonaceous mudstone and coal |
| Benxi Formation | 1 - 30 | the bottom of Benxi Formation is dark purple-red conglomerate-bearing iron mudstone with green aluminous mudstone, purple-grey silty mudstone and light flesh red microcrystalline limestone |