Geology for ELR NAJ1 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 -029y to 5M 1265y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 5M 1265y to 6M 0165y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 6M 0165y to 6M 0961y | Thames Group - Clay, Silt, Sand and Gravel |