Geology for ELR SDP2 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 |
|---|---|---|---|
| 84M 0197y to 84M 1595y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 84M 1595y to 85M 0715y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 85M 0715y to 87M 0715y | White Chalk Subgroup - Chalk | ||
| 87M 0715y to 90M 0055y | Sand and Gravel | Sand and Gravel of Uncertain Age and Origin | White Chalk Subgroup - Chalk |
| 90M 0055y to 91M 0019y | Silt | Brickearth | White Chalk Subgroup - Chalk |