| | Rock mass | Depth (m) | Thickness (m) | Rock mass description |
| | Mudstone and siltstone | 296.37 | 296.37 | Mudstone: dark grey, including carbon in section and iron-sandstone. Siltstone: grey, massive block, simple structure containing fossil plant pieces | | Medium-grained sandstone | 301.47 | 5.1 | Medium-grained sandstone: grey, blocky, mineral composition with quartz | | Mudstone | 304.11 | 2.64 | Mudstone: blocky, uniform, with fossil pieces | | Coal seam no. 3 | 306.17 | 2.06 | Coal: black, powdery, dim glossiness, unclear structure | | Mudstone and medium-grained sandstone | 318.17 | 12 | Mudstone: blocky, simple structure with fossil plant pieces. Medium-grained sandstone: grey, massive block, mineral composition with strong quartz | | Coal seam no. 5 | 321.39 | 3.22 | Coal: black, blocky, bright coal, lightweight, and crisp | | Sandy mudstone | 324.41 | 3.02 | Sandy mudstone: dark grey, blocky, simple structure with fossil pieces | | Fine sandstone | 331.59 | 7.18 | Fine sandstone: light grey, blocky, uniform mineral composition |
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