Geology for ELR BBR 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 |
|---|---|---|---|
| 22M 0758y to 23M 0165y | Silt | Brickearth | Thames Group - Clay, Silt, Sand and Gravel |
| 23M 0165y to 23M 0495y | Silt | Brickearth | Lambeth Group - Clay, Silt, Sand and Gravel |
| 23M 0495y to 23M 1485y | Silt | Brickearth | White Chalk Subgroup - Chalk |
| 23M 1485y to 24M 1375y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 24M 1375y to 25M 0385y | Silt | Brickearth | White Chalk Subgroup - Chalk |
| 25M 0385y to 25M 0825y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 25M 0825y to 25M 1045y | Clay, Silt and Sand | Alluvium | Lambeth Group - Clay, Silt, Sand and Gravel |
| 25M 1045y to 25M 1705y | Silt | Brickearth | Lambeth Group - Clay, Silt, Sand and Gravel |
| 25M 1705y to 26M 0068y | Silt | Brickearth | Thames Group - Clay, Silt, Sand and Gravel |