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Beinn Iadain via Leac na Saighde

Walks

Acharn to Beinn Iadain

Summit height 571m total height ascended approximately 857m + approximately 18km.

This walk starts from the car park for Rahoy Hills Wildlife Reserve just north of Claggan on the A884. Follow the track through the woods with the Black Water River to the west. Once through the woods the track; crosses the river and the valley of Glean Dubh opens up. The track contours round the valley past a ruin; and then heads north towards Crosben. Before reaching the white building there is a rickety bridge to cross, this is not in a good condition so if possible avoid the bridge. There are a number of buildings at Crosben and it appears that owls use the buildings as there were a number of owl pellets around the house area. From Crosben head north west up the slope; towards Leac na Saighde between the 'V' in the rivers. Once on the ridge head in a north westerly direction towards the summit; keep an eye on the rock types, grey layered rock some appearing to lie on their side with vertical layers;. These rocks are Metamorphic, minerals formed through recrystallization of pre-existing rocks, as a result of changes in temperature and pressure;. Along this ridge are areas of metamorphosed; sandstones, then shales and mudstones, these rocks form part of the Moine Super Group, a sequence of metamorphic rocks that form the major rock type of the Scottish Highlands, between the Moine Thrust Belt to the NW and the Great Glen Fault to the South East. These rocks were formed during the Neoproterozic era from a period 1,000 to 542 million years ago. At the time of the Neoproterozoic all the land masses as we know them today formed a super continent called Rodinia. It was during the life of this super continent that a phenoman called Snowball Earth occurred; the planet was frozen. It was the breakup of this continent that released the planet from its frozen state. On ascent of the summit ridge; the rock changes to Basalt, an igneous rock formed during the Tertiary Period 65 - 2 million years ago, at a time when the Mid Atlantic Ridge began to open, splitting North America and Europe and creating Iceland. The summit is marked with a large cairn; and a trig point, plus there is also a summit lochan; surrounded by rock outcrops. From the summit head south keeping to the east of the fence line, however care should be taken not to go too close to the cliff edges;. There is a small stream Allt Beinn Iadain that runs down the ridge which has cut a steep gorge; through the cliff. This gorge should not be climbed down, traverse; across the top of this and a neighbouring gorge heading east and then descend down a grassy slope to follow the contours of the hill around Lon Beinn Iadain, keeping to the east of Lochan Beinn Iadain. The Allt Beinn Iadain gorge is of geological; importance as it contains the most complete Upper Creteacous rock sequence in Scotland, consisting mainly of Cenomanium Morvern Greensand and Loch Aline Glass Sand overlain by Santoian-Campanian Siliceous Limestone, there is a fossil rich Cenomanium Clay Layer. Also of note below the cliffs heading towards Lon Beinn Iadain are the remnants of buildings; and field systems, some suggest that the buildings were shielings; summer pasture areas, however the existence of field systems; suggest that these were more than seasonal quarters. This combined with other remnants of buildings in the valley suggest that this was a township. Follow the contours around Lon Beinn Iadain; and then keep to the north eastern side of the middle loch. Follow the level between the lochans and pass the eastern loch on the south side. Once at the end of the loch head due east towards the valley edge, then descend down the valley side to the bridge over the Black Water River;. Once over the river head south; through the wooded valley back to the car park.

 

 

 

To find out more about the geology of Morvern, take a look at the geology page.



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