Geology for ELR UHL 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 |
|---|---|---|---|
| 1M 0035y to 1M 1155y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 1M 1155y to 2M 0055y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 2M 0055y to 3M 0155y | Thames Group - Clay, Silt, Sand and Gravel |