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I have not built on this type of situation (I live on a sand bar and used to live on the Palouse - no rocks).
Are you saying that the wall that you want to build is only to be 6" high? If so, I would suggest that you use dry laid natural stone. It will look right without having to be precise like the Pisa wall. It will be much easier to chase the terrain that the shale has dealt you on the bottom and build it up to level with the varying stone than to try to force an artificial level base on top of it to build Pisa on. It will also be easy to make minor alterations to maintain it if/when it creeps on you.
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