Geology for ELR SMS2 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 |
|---|---|---|---|
| 7M 0448y to 8M 0605y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 8M 0605y to 9M 0715y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 9M 0715y to 11M 0935y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 11M 0935y to 11M 1375y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 11M 1375y to 11M 1705y | Thanet Sand Formation - Sand, Silt and Clay | ||
| 11M 1705y to 12M 0949y | White Chalk Subgroup - Chalk |