Geology for ELR GRS1 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 |
|---|---|---|---|
| 109M 1212y to 109M 1485y | Sand and Gravel | River Terrace Deposits Ⓤ | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 109M 1485y to 111M 0275y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 111M 0275y to 112M 0008y | Clay, Silt and Sand | Alluvium | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |