We came across a dry stone wall in Lancashire a while back that was obviously being rebuilt. I was interested in the visible partitions along it creating zipper joints every ten feet or so.
These seemed to be places repair work on the wall had stopped for the day and then started again the next day. The seams seemed far less seamless than other wall repairs I've seen in my travels.
These obvious breaks in the stonework came about by trying to join up to previous repair work which has not been staggered gradually enough to integrate any new stonework into it. You would think a dry stone repair with such disconnected sections like these one would make the wall very weak .