Geology for ELR CON3 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 |
|---|---|---|---|
| 22M 0954y to 23M 0495y | Diamicton | Till | Inverclyde Group - Sandstone, Siltstone and Mudstone |
| 23M 0495y to 23M 1265y | Inverclyde Group - Sandstone, Siltstone and Mudstone | ||
| 23M 1265y to 23M 1705y | Unnamed Extrusive Rocks, Dinantian - Mafic Lava and Mafic Tuff | ||
| 23M 1705y to 24M 0055y | Inverclyde Group - Sandstone, Siltstone and Mudstone | ||
| 24M 0055y to 24M 0825y | Diamicton | Till | Inverclyde Group - Sandstone, Siltstone and Mudstone |
| 24M 0825y to 24M 1045y | Sand and Gravel | Raised Marine Deposits Ⓤ | Inverclyde Group - Sandstone, Siltstone and Mudstone |
| 24M 1045y to 24M 1244y | Inverclyde Group - Sandstone, Siltstone and Mudstone |