Geology for ELR HEN 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 |
|---|---|---|---|
| 30M 1709y to 31M 0275y | Sand and Gravel | River Terrace Deposits Ⓤ | Lambeth Group - Clay, Silt, Sand and Gravel |
| 31M 0275y to 32M 0935y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 32M 0935y to 33M 0055y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 33M 0055y to 34M 0935y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 34M 0935y to 35M 0715y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 35M 0715y to 35M 1146y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |