Geology for ELR HYM 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 |
|---|---|---|---|
| 42M 0380y to 42M 1375y | Clay, Silt and Sand | Alluvium | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ |
| 42M 1375y to 43M 1582y | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ |