
pronounced ) is a mountain in the Torridon Hills, in the Northwest Highlands of Scotland. It stands between Loch Torridon and the neighbouring mountain Beinn Eighe. The mountain is a ridge running east–west, with several peaks, and its upper half is made up of many steep rocky terraces. The highest peak is the Munro of '''Spidean a' Choire Lèith''' ('peak of the grey corrie') at high. The other Munro peak is Mullach an Rathain at high.
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pronounced ) is a mountain in the Torridon Hills, in the Northwest Highlands of Scotland. It stands between Loch Torridon and the neighbouring mountain Beinn Eighe. The mountain is a ridge running east–west, with several peaks, and its upper half is made up of many steep rocky terraces. The highest peak is the Munro of '''Spidean a' Choire Lèith''' ('peak of the grey corrie') at high. The other Munro peak is Mullach an Rathain at high.
==Geology== thumb|left|The rocky terraces of Liathach seen from Beinn Eighe The mountain is composed of Torridonian sandstone which forms massive near-horizontal strata. They form the numerous terraces that are obvious from afar. The rocks are mainly red and chocolate sandstones, arkoses, flagstones and shales with coarse conglomerates 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. Some of the peaks, such as Beinn Eighe, are capped with white quartzite, giving them a distinctive appearance when seen from afar. Some of the quartzite contains fossilized worm burrows and is known as pipe rock. It is about 500 million years old. The Torridon landscape is itself highly denuded by glacial and alluvial action, and represents the remnants of an ancient peneplain.
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