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Trumpet pipes (monocriterion) in the Pipe Rock Member
of the Eriboll Quartzite Formation, bedding plane sections. Upper, undeformed
(approximately circular) pipes, Coire a, Bhraic, Assynt. Lower, deformed
(elliptical) pipes due to thrusting, Ben Heilem, Eriboll.
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Looking ~N beneath the Stac of Glencoul summit at
a bedding normal section, showing an originally vertical 'pipe' in
the Pipe Rock Member (PR) of the Cambrian
Quartzites. The pipe has been sheared over by an angle
due to the emplacement of the Moine Thrust
nappe above and would produce an elliptical outcrop on a bedding plane
section, similar to that shown above at Ben Heilem. |