Geology for ELR WIS 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 |
|---|---|---|---|
| 29M 0259y to 35M 1375y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 35M 1375y to 35M 1705y | |||
| 35M 1705y to 36M 0275y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 36M 0275y to 36M 1155y | |||
| 36M 1155y to 37M 0495y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 37M 0495y to 37M 0825y | Clay, Silt and Sand | Alluvium | Thames Group - Clay, Silt, Sand and Gravel |
| 37M 0825y to 38M 0385y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 38M 0385y to 38M 0495y | Clay, Silt and Sand | Alluvium | Thames Group - Clay, Silt, Sand and Gravel |
| 38M 0495y to 42M 0715y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 42M 0715y to 45M 1074y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |