41. There is an unconformity where the Karoo rocks of the basin overlie much older rocks. 42. The granitoid layer below the unconformity turned out to be 3.52 billion years old. 43. The unconformity is well exposed on the shores of Gairloch, Loch Maree and Loch Torridon. 44. Generally this occurs in certain carbon-bearing sediments, within an unconformity in sedimentary strata. 45. The Great Falls themselves formed on a fall line unconformity in the Great Falls Tectonic Zone. 46. At Thornton Force it crosses a notable unconformity into the underlying, steeply inclined Ordovician greywackes. 47. These are followed by an unconformity . 48. The Upper Westphalian shows an important unconformity at its base and is made up of conglomerates. 49. The surface of this angular unconformity truncates dipping strata comprising the folded and faulted Unkar Group. 50. This member forms small hills within the Great Unconformity on either side of the Chuar syncline.
