Scottish Highlands in the Torridon Hills such as Liathach and Beinn Eighe in Wester Ross. These foundations are interspersed with many igneous intrusions of a more recent age, the remnants of which have formed mountain massifs such as the Cairngorms and the Cuillin of Skye. A significant exception to the above are the fossil-bearing beds of Old Red Sandstone found principally along the Moray Firth coast and partially down the Highland Boundary Fault. The Jurassic beds found in isolated locations on Skye and Applecross reflect the complex underlying geology. They are the original source of much North Sea oil. The Great Glen
Scottish island names Shetland, and Kirk Rocks in Orkney. Great Cumbrae and Little Cumbrae are English/Brythonic in derivation and there are other examples of the use of "great" and "little" such as Great Bernera and Rysa Little which are English/Gaelic and Norse/English respectively. The informal use of "Isle of" is commonplace, although only the Isle of Ewe, the Isle of May and Isle Martin of the larger Scottish islands use this nomenclature in a formal sense. "Island" also occurs, as in Island Macaskin and Mealista Island although both islands are also known by their Gaelic names of "Eilean Macaskin" and "Eilean Mhealasta". Holy