See detailed information for ELR HDB
⚠️ Geology shown below is based on British Geological Survey (BGS) low-resolution data sampled at 100 metre intervals along the ELR. The geology relative to the mileages should not be treated as accurate or complete. Data marked with Ⓤ is classed as undifferentiated by the BGS.
| Mileage | Material | Deposit | Bedrock |
|---|---|---|---|
| 4M 1182y to 7M 0055y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 7M 0055y to 7M 0715y | Sand and Gravel | Glacial Sand and Gravel | Thames Group - Clay, Silt, Sand and Gravel |
| 7M 0715y to 9M 1155y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 9M 1155y to 9M 1595y | Sand and Gravel | Glacial Sand and Gravel | Thames Group - Clay, Silt, Sand and Gravel |
| 9M 1595y to 12M 1705y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 12M 1705y to 14M 0495y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 14M 0495y to 14M 0935y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 14M 0935y to 14M 1485y | Sand and Gravel | Sand and Gravel of Uncertain Age and Origin | Thames Group - Clay, Silt, Sand and Gravel |
| 14M 1485y to 15M 1045y | Diamicton | Till | Thames Group - Clay, Silt, Sand and Gravel |
| 15M 1045y to 16M 1045y | Sand and Gravel | Sand and Gravel of Uncertain Age and Origin | Thames Group - Clay, Silt, Sand and Gravel |
| 16M 1045y to 17M 0275y | Diamicton | Till | Thames Group - Clay, Silt, Sand and Gravel |
| 17M 0275y to 17M 0825y | Diamicton | Till | Lambeth Group - Clay, Silt, Sand and Gravel |
| 17M 0825y to 18M 0275y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 18M 0275y to 18M 1705y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 18M 1705y to 19M 0385y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 19M 0385y to 19M 0825y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 19M 0825y to 19M 1705y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 19M 1705y to 20M 0825y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 20M 0825y to 20M 0935y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 20M 0935y to 22M 0935y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 22M 0935y to 24M 0055y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 24M 0055y to 24M 1155y | White Chalk Subgroup - Chalk | ||
| 24M 1155y to 24M 1705y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 24M 1705y to 25M 1155y | White Chalk Subgroup - Chalk | ||
| 25M 1155y to 29M 0149y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |