Geology for ELR NHM3 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 |
|---|---|---|---|
| 18M 0709y to 18M 1471y | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |