Geology for ELR EYD4 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 |
|---|---|---|---|
| 73M 0597y to 73M 1155y | Silt | Brickearth | Bracklesham Group and Barton Group Ⓤ - Sand, Silt and Clay |
| 73M 1155y to 73M 1375y | Silt | Brickearth | Thames Group - Clay, Silt, Sand and Gravel |
| 73M 1375y to 74M 0072y | Silt | Brickearth | Bracklesham Group and Barton Group Ⓤ - Sand, Silt and Clay |