Geology for ELR GOB 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 -008y to 0M 0495y | Llandovery Rocks Ⓤ - Mudstone, Siltstone and Sandstone | ||
| 0M 0495y to 3M 0216y | Pridoli Rocks Ⓤ - Mudstone, Siltstone and Sandstone |