| The Stonehaven Group lies at the base of the Old Red Sandstone in the Midland Valley of Scotland and sits unconformably on the Highland Border Complex. |
| Basement rocks consist of Tortonian volcanic rocks unconformably overlain by Messinian marine marls, coral-reef limestones and carbonate breccias. |
| This series is overlain unconformably by a younger quartzite of similar character, and itself rests upon the crystalline schists. |
| Upon this foundation rests unconformably a series of marls and limestones of Eocene and early Oligocene age. |
| These mid-Palaeozoic formations are unconformably overlain by the Carboniferous-Permian Pillahuinco Group. |
| At Llandovery they rest unconformably upon Ordovician rocks, but in many other places no unconformity is traceable. |
