Geology for ELR BDL 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 |
|---|---|---|---|
| 5M 1588y to 6M 0495y | Dinantian Rocks Ⓤ - Limestone with Subordinate Sandstone and Argillaceous Rocks | ||
| 6M 0495y to 7M 0935y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 7M 0935y to 8M 0935y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 8M 0935y to 8M 1626y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone |