Geology for ELR BTK4 is based on British Geological Survey (BGS) low-resolution data sampled at 100 metre intervals along the ELR. The geology presented should not be treated as accurate or complete. Data marked with Ⓤ is classed as undifferentiated by the BGS.
| Mileage | Material | Deposit | Bedrock |
|---|---|---|---|
| 0M -022y to 0M 0165y | Zechstein Group - Dolomitised Limestone and Dolomite | ||
| 0M 0165y to 0M 0477y | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ |