Geology for ELR GSM4 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 |
|---|---|---|---|
| 105M 1534y to 106M 0385y | Clay, Silt and Sand | Alluvium | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 106M 0385y to 107M 0165y | Diamicton | Till | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 107M 0165y to 107M 1265y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 107M 1265y to 107M 1375y | Diamicton | Till | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 107M 1375y to 108M 0385y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 108M 0385y to 108M 1155y | Diamicton | Till | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 108M 1155y to 109M 0055y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 109M 0055y to 109M 0275y | Diamicton | Till | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 109M 0275y to 109M 1375y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 109M 1375y to 110M 0825y | Diamicton | Till | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 110M 0825y to 112M 0605y | Lias Group - Mudstone, Siltstone, Limestone and Sandstone | ||
| 112M 0605y to 116M 1155y | Diamicton | Till | Lias Group - Mudstone, Siltstone, Limestone and Sandstone |
| 116M 1155y to 116M 1595y | Diamicton | Till | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone |
| 116M 1595y to 120M 0331y | Triassic Rocks Ⓤ - Mudstone, Siltstone and Sandstone |