Geology for ELR BTL 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 |
|---|---|---|---|
| 0M -093y to 0M 0055y | Sand and Gravel | Sand and Gravel of Uncertain Age and Origin | White Chalk Subgroup - Chalk |
| 0M 0055y to 1M 0275y | White Chalk Subgroup - Chalk | ||
| 1M 0275y to 1M 0715y | Diamicton | Clay-With-Flints | White Chalk Subgroup - Chalk |
| 1M 0715y to 3M 1485y | White Chalk Subgroup - Chalk | ||
| 3M 1485y to 4M 0055y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 4M 0055y to 7M 1705y | White Chalk Subgroup - Chalk | ||
| 7M 1705y to 8M 0190y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |