Editing Traligill and Bealach Traligill, North-west Highlands - an excursion

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== Locality 7.9 Breabag Tarsuinn. [NC 3020 1904]  ==
 
== Locality 7.9 Breabag Tarsuinn. [NC 3020 1904]  ==
At this point, steeply dipping Salterella Grit Member is exposed. To the north is the south ridge of Conival, composed of Torridon Group conglomerate and sandstone. Below that ridge, in the Garbh Coire, is the unconformity between Torridon Group sandstones and Lewisian gneiss.
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At this point, steeply dipping Salterella Grit Member is exposed. To the north is the south ridge of Conival, composed of Torridon Group conglom-erate and sandstone. Below that ridge, in the Garbh Coire, is the unconfor-mity between Torridon Group sandstones and Lewisian gneiss.
  
 
The Ben More Thrust runs below the ridge and dips steeply towards the east [[Media:EGS_NWH_FIG_057.jpg| (See image)]]. Note that the Ben More Thrust descends steeply from a height of about 900m, almost at the top of Conival, to the Bealach Traligill at about 500m. A thin sliver of pale-weathering, highly sheared Lewisian gneiss occurs just above the Ben More Thrust and below the Torridon Group. This occurrence can be explained in two ways. Butler (1997) argued that the bedding in the Torridon Group abuts against the Lewisian gneiss at a high angle, and that the contact is a Precambrian normal fault. An alternative view is constrained by the fact that just above the Lewisian gneiss–Torridon Group contact there is a tight anticline-syncline pair within the Torridon Group, similar to folds that occur further south on Sgonnan Mòr (Johnson and Parsons, 1979). This would suggest that the Lewisian gneiss–Torridon Group contact is an unconformity, highly modified by thrusting and associated folding and shearing along the Ben More Thrust.
 
The Ben More Thrust runs below the ridge and dips steeply towards the east [[Media:EGS_NWH_FIG_057.jpg| (See image)]]. Note that the Ben More Thrust descends steeply from a height of about 900m, almost at the top of Conival, to the Bealach Traligill at about 500m. A thin sliver of pale-weathering, highly sheared Lewisian gneiss occurs just above the Ben More Thrust and below the Torridon Group. This occurrence can be explained in two ways. Butler (1997) argued that the bedding in the Torridon Group abuts against the Lewisian gneiss at a high angle, and that the contact is a Precambrian normal fault. An alternative view is constrained by the fact that just above the Lewisian gneiss–Torridon Group contact there is a tight anticline-syncline pair within the Torridon Group, similar to folds that occur further south on Sgonnan Mòr (Johnson and Parsons, 1979). This would suggest that the Lewisian gneiss–Torridon Group contact is an unconformity, highly modified by thrusting and associated folding and shearing along the Ben More Thrust.

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