Geology for ELR THA 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 -185y to 0M 0385y | Grey Chalk Subgroup - Chalk | ||
| 0M 0385y to 9M 0165y | Gault Formation and Upper Greensand Formation Ⓤ - Mudstone, Sandstone and Limestone | ||
| 9M 0165y to 10M 0495y | Lower Greensand Group - Sandstone and Mudstone | ||
| 10M 0495y to 10M 1375y | Gault Formation and Upper Greensand Formation Ⓤ - Mudstone, Sandstone and Limestone | ||
| 10M 1375y to 10M 1705y | Lower Greensand Group - Sandstone and Mudstone | ||
| 10M 1705y to 12M 1045y | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone | ||
| 12M 1045y to 13M 0495y | Portland Group - Limestone and Calcareous Sandstone | ||
| 13M 0495y to 13M 1265y | Wealden Group - Sandstone and Siltstone, Interbedded | ||
| 13M 1265y to 13M 1705y | Portland Group - Limestone and Calcareous Sandstone | ||
| 13M 1705y to 15M 0495y | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone | ||
| 15M 0495y to 17M 1705y | Corallian Group - Limestone, Sandstone, Siltstone and Mudstone | ||
| 17M 1705y to 18M 0495y | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone | ||
| 18M 0495y to 18M 1213y | Clay, Silt and Sand | Alluvium | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone |