Geology for ELR ARH 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 |
|---|---|---|---|
| 30M 0970y to 30M 1595y | Sand and Gravel | Raised Marine Deposits Ⓤ | Clackmannan Group - Sedimentary Rock Cycles, Clackmannan Group Type |
| 30M 1595y to 31M 0605y | Sand and Gravel | Raised Marine Deposits Ⓤ | Inverclyde Group - Sandstone, Siltstone and Mudstone |
| 31M 0605y to 31M 0715y | Inverclyde Group - Sandstone, Siltstone and Mudstone | ||
| 31M 0715y to 31M 0975y |