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The problem with gravel in a chicken run is that all the poop washes down into it and remains there to rot and stink every time it gets wet.

Most people would put an anti-dig barrier down 12 inches so it sounds like you've probably got a decent anti-dig barrier on that side. No guarantees, but more likely safe than not. :)

I suggest that you dig a small test hole next to those blocks to find out how deep the concrete goes.