At this point the 61° bearing line has been followed for 3.3 miles, to the upper slopes of the valley of the River Clyde. A bit ahead of where this photo was snapped there is a wide eroded swath that might be a road cut, with a drainage ditch along one side.
If it is an ancient road cut, it isn't very convincing by itself, maybe because of the dense woods which makes envisioning the terrain difficult. It becomes more convincing when seeing that this site is aligned with other evidence in each direction.
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