Geology for ELR SWB 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 |
|---|---|---|---|
| 82M 1667y to 83M 0385y | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone | ||
| 83M 0385y to 83M 0715y | Corallian Group - Limestone, Sandstone, Siltstone and Mudstone | ||
| 83M 0715y to 90M 0825y | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 90M 0825y to 90M 1705y | Clay, Silt and Sand | Alluvium | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone |
| 90M 1705y to 93M 0385y | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 93M 0385y to 93M 0935y | Great Oolite Group - Sandstone, Limestone and Argillaceous Rocks | ||
| 93M 0935y to 94M 0275y | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 94M 0275y to 102M 1595y | Great Oolite Group - Sandstone, Limestone and Argillaceous Rocks | ||
| 102M 1595y to 103M 0385y | Inferior Oolite Group - Limestone, Sandstone, Siltstone and Mudstone | ||
| 103M 0385y to 105M 0055y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 105M 0055y to 106M 0385y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 106M 0385y to 106M 0715y | Clay, Silt and Sand | Alluvium | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone |
| 106M 0715y to 106M 0935y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 106M 0935y to 106M 1485y | Clay, Silt and Sand | Alluvium | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone |
| 106M 1485y to 106M 1705y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 106M 1705y to 110M 0605y | South Wales Upper Coal Measures Formation - Mudstone, Siltstone, Sandstone, Coal, Ironstone and Ferricrete | ||
| 110M 0605y to 110M 1705y | Triassic Rocks Ⓤ - Sandstone and Conglomerate, Interbedded | ||
| 110M 1705y to 111M 1485y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 111M 1485y to 112M 1732y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |