Geology for ELR ECA1 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 |
|---|---|---|---|
| 73M 0253y to 73M 1265y | Sand and Gravel | Glacial Sand and Gravel | Strathclyde Group - Sedimentary Rock Cycles, Strathclyde Group Type |
| 73M 1265y to 73M 1368y | Sand and Gravel | Glacial Sand and Gravel | Unnamed Extrusive Rocks, Dinantian - Mafic Lava and Mafic Tuff |