Information AboutTorridon Sandstone |
| CATEGORIES ABOUT TORRIDONIAN | |
| sedimentary rocks | |
| geology of scotland | |
| caithness | |
| sutherland | |
| ross and cromarty | |
| skye and lochalsh | |
| geologic formations | |
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The rocks are mainly red and chocolate Sandstone s, Arkose s, Flagstone s and Shale s with coarse Conglomerate s locally at the base. Some of the materials of these rocks were derived from the underlying Lewisian Gneiss , upon the uneven surface of which they rest, but the bulk of the material was obtained from rocks that are nowhere now exposed. Upon this ancient denuded land surface the Torridonian strata rest horizontally or with gentle Inclination . Their outcrop extends in a belt of variable breadth from Cape Wrath to the Point of the peninsula of Sleat in Skye , running in a N.N.E.-S.S.W. direction through Caithness , Sutherland , Ross And Cromarty , and Skye And Lochalsh . They form the isolated mountain peaks of Canisp , Quinag and Suilven in the area of Loch Assynt , of Slioch near Loch Maree , and other hills. They attain their maximum development in the Applecross , Gairloch and Torridon districts, form the greater part of Scalpay , and occur also in Rùm , Raasay , Soay and the Crowlin Islands . The Torridonian rocks have been subdivided into three groups: an upper Aultbea Group , 3000-5000 ft.; a middle or Applecross Group , 6000-8000 ft.; and a lower or Diabeg Group , 500 ft. in Gairloch but reaching a thickness of 7200 ft. in Skye. |
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