Torridon Hills - Rock Types

Rock Types

These are mainly made of a type of sandstone, known as Torridonian sandstone (see Geology of Great Britain), which over time has become eroded to produce the unique characteristics of the Torridon Hills. In geology, Torridonian describes a series of proterozoic arenaceous sedimentary rocks of Precambrian age. They are amongst the oldest rocks in Britain, and sit on yet older rocks, Lewisian gneiss. Some of the highest peaks, such as Beinn Eighe are crowned by white Cambrian quartzite, which gives those peaks a distinctive appearance. Some of the quartzite contains fossilized worm burrows and known as pipe rock. It is circa 500 million years old. The strata are largely horizontal, and have weathered into terraces on the mountains.

Each of the Torridon Hills sits very much apart from one another, and they are often likened to castles. They have steep terraced sides, and broken summit crests, riven into many pinnacles. There are numerous steep gullies running down the terraced sides from the peaks. The summit ridges provide excellent scrambling, and are popular with hillwalkers and mountaineers. However, like many ridge routes, there are few escape points, so once committed, the scrambler or hillwalker must complete the entire ridge before descent.

There are numerous other mountains outside the immediate area of Loch Torridon which have the same characteristics, such as An Teallach near Ullapool.