Geology for ELR STS 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 |
|---|---|---|---|
| 51M 0233y to 51M 0825y | Grey Chalk Subgroup - Chalk | ||
| 51M 0825y to 51M 1485y | Gault Formation and Upper Greensand Formation Ⓤ - Mudstone, Sandstone and Limestone | ||
| 51M 1485y to 52M 0935y | Clay, Silt and Sand | Alluvium | Gault Formation and Upper Greensand Formation Ⓤ - Mudstone, Sandstone and Limestone |
| 52M 0935y to 53M 1045y | Clay, Silt and Sand | Alluvium | Grey Chalk Subgroup - Chalk |
| 53M 1045y to 54M 0605y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 54M 0605y to 55M 0275y | White Chalk Subgroup - Chalk | ||
| 55M 0275y to 57M 1265y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 57M 1265y to 58M 0055y | White Chalk Subgroup - Chalk | ||
| 58M 0055y to 58M 0385y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 58M 0385y to 59M 0057y | White Chalk Subgroup - Chalk |