Geology for ELR BTC 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 0286y to 8M 0275y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 8M 0275y to 8M 0605y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 8M 0605y to 8M 0715y | Thanet Sand Formation - Sand, Silt and Clay | ||
| 8M 0715y to 8M 0935y | Clay, Silt and Sand | Alluvium | Thanet Sand Formation - Sand, Silt and Clay |
| 8M 0935y to 8M 1639y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |