Geology for ELR WBB 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 |
|---|---|---|---|
| 23M 1706y to 23M 1733y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 23M 1733y to 24M 0385y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 24M 0385y to 25M 1045y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 25M 1045y to 26M 0715y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 26M 0715y to 27M 0495y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 27M 0495y to 27M 1705y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 27M 1705y to 28M 1155y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 28M 1155y to 28M 1317y | White Chalk Subgroup - Chalk |