| Serpentinite and sedimentary melange (Palaeozoic) |
| Ordovician granitic rocks |
| Lr Palaeozoic basic-intermediate intrusion |
| Siluro-Devonian granitic rocks & appinite |
| Palaeogene granitic rocks |
| Palaeogene rhyolite |
| Palaeogene basic intrusive rocks |
| Palaeoproterozoic gneiss |
| Mesoproterozoic gneiss |
| Neoproterozoic schist and gneiss |
| Neoproterozoic metasedimentary rocks - Dalradian |
| Cambrian greywacke, slate, quartzite |
| Ordovician volcanic rocks |
| Lower-Middle Ordovician slate, sandstone, greywacke, conglomerate |
| Middle-Upper Ordovician slate, sandstone, greywacke, conglomerate |
| Late Ordovician-Silurian deep marine greywacke, mudstone (Longford-Down) |
| Silurian terrestrial - shallow marine sandstone, siltstone, conglomerate |
| Silurian deep marine mudstone, greywacke & conglomerate |
| Devonian volcanic rocks |
| ORS, sandstone, conglomerate & mudstone |
| Up. Devonian sandstone & mudstone (Old Head Sandstone Fm) |
| Carboniferous volcanic rocks |
| Tournaisian sandstone, mudstone, limestone |
| Tournaisian limestone |
| Visean limestone & calcareous shale |
| Visean sandstone, mudstone & evaporite |
| Visean to Westphalian redbed sandstone, conglomerate & mudstone |
| Namurian shale, sandstone, siltstone & coal |
| Westphalian shale, sandstone, siltstone & coal |
| Permian sandstone, conglomerate, evaporite |
| Triassic sandstone, mudstone, evaporite |
| Jurassic mudstone & limestone |
| Cretaceous chalk, flint, glauconitic sandstone |
| Palaeocene basalt lava |
| Oligocene clay, sand & lignite |
