Geology for ELR ELY 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 -073y to 0M 0055y | Sand and Gravel | Glacial Sand and Gravel | South Wales Upper Coal Measures Formation - Mudstone, Siltstone, Sandstone, Coal, Ironstone and Ferricrete |
| 0M 0055y to 0M 0715y | Clay, Silt and Sand | Alluvium | Pennine Middle Coal Measures Formation and South Wales Middle Coal Measures Formation Ⓤ |
| 0M 0715y to 0M 1045y | Clay, Silt and Sand | Alluvium | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |
| 0M 1045y to 0M 1138y | Diamicton | Till | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |
| 0M 1138y to 0M 1177y | Sand and Gravel | Glacial Sand and Gravel | Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation Ⓤ |