Thick stone wall -Stirling

I took a walk a few weeks ago with nothing too much to show for it. For example, the question of whether this is a structure?

Or if this thick wall is special?:

And noticing some quartz (note the position of the fallen log beyond):

 

And under the log, notice the shallow dish.

Not sure what to make of that. The wall soon lost its thickness and went back to being a more normal single rock thickness.