Geology for ELR FED 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 |
|---|---|---|---|
| 83M 0842y to 84M 0055y | Sand and Gravel | Glacial Sand and Gravel | Neogene to Quaternary Rocks Ⓤ - Gravel, Sand, Silt and Clay |
| 84M 0055y to 84M 0825y | Sand and Gravel | Crag Group | Neogene to Quaternary Rocks Ⓤ - Gravel, Sand, Silt and Clay |
| 84M 0825y to 84M 1595y | Sand and Gravel | Crag Group | Thames Group - Clay, Silt, Sand and Gravel |
| 84M 1595y to 85M 0055y | Clay, Silt and Sand | Alluvium | Thames Group - Clay, Silt, Sand and Gravel |
| 85M 0055y to 85M 1375y | Clay, Silt and Sand | Alluvium | Lambeth Group - Clay, Silt, Sand and Gravel |
| 85M 1375y to 86M 0165y | Sand and Gravel | Crag Group | Lambeth Group - Clay, Silt, Sand and Gravel |
| 86M 0165y to 86M 0385y | Clay, Silt and Sand | Alluvium | Lambeth Group - Clay, Silt, Sand and Gravel |
| 86M 0385y to 86M 0715y | Clay, Silt and Sand | Alluvium | Thames Group - Clay, Silt, Sand and Gravel |
| 86M 0715y to 86M 1230y | Thames Group - Clay, Silt, Sand and Gravel |