Geology for ELR BFB 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 -277y to 0M 0275y | Landslip | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | |
| 0M 0275y to 1M 0275y | Clay, Silt and Sand | Alluvium | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 1M 0275y to 3M 1375y | Landslip | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | |
| 3M 1375y to 4M 0605y | Clay, Silt and Sand | Alluvium | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 4M 0605y to 5M 0605y | Landslip | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | |
| 5M 0605y to 5M 0825y | Landslip | Inferior Oolite Group - Limestone, Sandstone, Siltstone and Mudstone | |
| 5M 0825y to 6M 0715y | Inferior Oolite Group - Limestone, Sandstone, Siltstone and Mudstone | ||
| 6M 0715y to 8M 0495y | Great Oolite Group - Sandstone, Limestone and Argillaceous Rocks | ||
| 8M 0495y to 8M 1155y | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 8M 1155y to 8M 1485y | Clay, Silt and Sand | Alluvium | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone |
| 8M 1485y to 9M 0398y | Kellaways Formation and Oxford Clay Formation Ⓤ - Mudstone, Siltstone and Sandstone |