Editing Stoer Group at Enard Bay, North-west Highlands - an excursion

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== Locality 4.5 ‘Salmon Bothy’ Bay, west side: ‘drop stones’ in the Clachtoll Formation. [NC 0278 1463] ==
 
== Locality 4.5 ‘Salmon Bothy’ Bay, west side: ‘drop stones’ in the Clachtoll Formation. [NC 0278 1463] ==
Just above high-water mark, metre-sized gneiss blocks are embedded in laminated red mudstone and sandstone. These outcrops have been the source of significant controversy, with the blocks being variously interpreted as ice-rafted drop stones (Davison and Hambrey, 1996) and as mass-flow deposits (Young 1999). Bedding in the surrounding mudstone and sandstone has been deformed; generally there is more deformation on the south side, suggesting southward, lateral rather than vertical emplacement. Towards the south, at the level of the gneiss boulders, oscillation ripples and desiccation cracks occur on bedding planes; Young (1999) noted that these indicate shallow to subaerial conditions of deposition, whereas ice-rafting of dropstones >1m across would have necessitated significant water depths. To the north and on the wave-cut platform, the mudstone passes laterally into a boulder conglomerate. Young (1999) suggested that these conglomerates were formed in debris fans along the margins of lakes, with blocks of gneiss from adjacent basement highs or scarps periodically sliding into the lakes, and a similar model was favoured by Stewart (2002).
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Just above high-water mark, metre-sized gneiss blocks are embedded in laminated red mudstone and sandstone. These outcrops have been the source of significant controversy, with the blocks being variously interpreted as ice-rafted drop stones (Davison and Hambrey, 1996) and as mass-flow deposits (Young 1999). Bedding in the surrounding mudstone and sandstone has been deformed; generally there is more deformation on the south side, suggesting southward, lateral rather than vertical emplacement. Towards the south, at the level of the gneiss boulders, oscillation ripples and desiccation cracks occur on bedding planes; Young (1999) noted that these indicate shallow to subaerial conditions of deposition, whereas ice-rafting of dropstones >1m across would have necessitated significant water depths. To the north and on the wave-cut platform, the mudstone passes laterally into a boulder conglomerate. Young (1999) suggested that these conglom-erates were formed in debris fans along the margins of lakes, with blocks of gneiss from adjacent basement highs or scarps periodically sliding into the lakes, and a similar model was favoured by Stewart (2002).
  
 
Walk past the ruined salmon bothy to the east side of the bay, and cross a prominent C-shaped tidal inlet onto a small peninsula – this is possible at all but the highest tide.
 
Walk past the ruined salmon bothy to the east side of the bay, and cross a prominent C-shaped tidal inlet onto a small peninsula – this is possible at all but the highest tide.

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