Geology for ELR BSF 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 1555y to 0M 1602y | Clay, Silt and Sand | Alluvium | |
| 0M 1602y to 1M 0605y | Clay, Silt and Sand | Alluvium | Thames Group - Clay, Silt, Sand and Gravel |
| 1M 0605y to 1M 1155y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 1M 1155y to 1M 1372y | Clay, Silt and Sand | Alluvium | Thames Group - Clay, Silt, Sand and Gravel |