Geology for ELR BOO 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 |
|---|---|---|---|
| 4M 0544y to 4M 0935y | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ | ||
| 4M 0935y to 5M 0495y | Sand and Gravel | River Terrace Deposits Ⓤ | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ |
| 5M 0495y to 6M 0689y | Clay, Silt and Sand | Alluvium | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ |