Channelled joint

At one point we found the mark of the channelling machine - air drills working as broaching tools to cut a slot across the rock. Usually done where no convenient "joint" existed, here it appears to have been done to form an edge where a section of wall was cut away.

This photograph is by grahami and was uploaded October 15th 2007. © grahami please do not copy or distribute without prior express permission.

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