Geology for ELR XRC 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 -009y to 1M 0605y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 1M 0605y to 3M 1045y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 3M 1045y to 4M 0385y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 4M 0385y to 7M 0942y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |