Geology for ELR HBS 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 0435y to 3M 0605y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 3M 0605y to 5M 0825y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 5M 0825y to 5M 1045y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 5M 1045y to 6M 1595y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 6M 1595y to 10M 0275y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 10M 0275y to 10M 0825y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 10M 0825y to 11M 0605y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 11M 0605y to 11M 1375y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 11M 1375y to 12M 0825y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 12M 0825y to 14M 0165y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 14M 0165y to 18M 0935y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 18M 0935y to 18M 1485y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 18M 1485y to 19M 1595y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 19M 1595y to 22M 0495y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 22M 0495y to 22M 1595y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 22M 1595y to 23M 1155y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 23M 1155y to 26M 0825y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 26M 0825y to 26M 1485y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 26M 1485y to 29M 1045y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 29M 1045y to 31M 0165y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 31M 0165y to 32M 1155y | Sand and Gravel | Glacial Sand and Gravel | White Chalk Subgroup - Chalk |
| 32M 1155y to 36M 1705y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 36M 1705y to 37M 1265y | White Chalk Subgroup - Chalk | ||
| 37M 1265y to 39M 1705y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 39M 1705y to 41M 0385y | White Chalk Subgroup - Chalk | ||
| 41M 0385y to 41M 0935y | Diamicton | Till | White Chalk Subgroup - Chalk |
| 41M 0935y to 42M 1375y | Diamicton | Till | Wealden Group - Mudstone, Siltstone and Sandstone |
| 42M 1375y to 49M 1485y | Diamicton | Till | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone |
| 49M 1485y to 50M 0495y | Sand and Gravel | Glacial Sand and Gravel | West Walton Formation, Ampthill Clay Formation and Kimmeridge Clay Formation Ⓤ - Mudstone |
| 50M 0495y to 50M 0948y | Sand and Gravel | Glacial Sand and Gravel | Corallian Group - Limestone, Sandstone, Siltstone and Mudstone |