Geology for ELR ELL1 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 |
|---|---|---|---|
| 0.-36km to 6.286km | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 6.286km to 6.588km | Sand and Gravel | River Terrace Deposits Ⓤ | |
| 6.588km to 6.689km | Sand and Gravel | River Terrace Deposits Ⓤ | Lambeth Group - Clay, Silt, Sand and Gravel |
| 6.689km to 6.889km | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 6.889km to 7.594km | Clay, Silt and Sand | Alluvium | Lambeth Group - Clay, Silt, Sand and Gravel |
| 7.594km to 7.996km | Clay, Silt and Sand | Alluvium | Thanet Sand Formation - Sand, Silt and Clay |
| 7.996km to 8.701km | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 8.701km to 9.304km | Clay, Silt and Sand | Alluvium | Thanet Sand Formation - Sand, Silt and Clay |
| 9.304km to 9.705km | Sand and Gravel | River Terrace Deposits Ⓤ | Thanet Sand Formation - Sand, Silt and Clay |
| 9.705km to 10.007km | Sand and Gravel | River Terrace Deposits Ⓤ | Lambeth Group - Clay, Silt, Sand and Gravel |
| 10.007km to 10.105km | Thames Group - Clay, Silt, Sand and Gravel |