Geology for ELR WCS 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 |
|---|---|---|---|
| 9M 0934y to 9M 1045y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 9M 1045y to 9M 1469y | Thames Group - Clay, Silt, Sand and Gravel |