Geology for ELR FHR4 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 |
|---|---|---|---|
| 2M 0213y to 3M 0825y | Diamicton | Till | Triassic Rocks Ⓤ - Sandstone and Conglomerate, Interbedded |
| 3M 0825y to 6M 0715y | Diamicton | Till | Millstone Grit Group - Mudstone, Siltstone and Sandstone |
| 6M 0715y to 7M 0605y | Sand and Gravel | Glacial Sand and Gravel | Millstone Grit Group - Mudstone, Siltstone and Sandstone |
| 7M 0605y to 9M 0165y | Sand and Gravel | Glacial Sand and Gravel | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |
| 9M 0165y to 9M 0275y | Diamicton | Till | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |
| 9M 0275y to 10M 1045y | Sand and Gravel | Glacial Sand and Gravel | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |
| 10M 1045y to 10M 1198y | Diamicton | Till | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |