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It has been suggested that there could be a bias against people choosing squares in the valley, due to the suspicion that rock art tends to be found on high ground.
I have also analysed the 'valley' squares (B1 B2 C2 C3) vs 'non valley' squares.
Target X: Valley 21.4%, Non Valley 78.6% (the results by chance should be 33% / 66% so there does also appear to be a small bias here - I don't see why two biases could not be working at the same time.
I've also compared the same squares on Target Y where there is no discernible valley.
Target Y: 'Valley' 42.8%, 'Non Valley' 57.2% (again vs 33% / 66%)
These seem closer to pure chance variations so there doesn't appear to be an effect where there's no valley visible.
They say you can prove anything via statistics so I think I've probably gone as far as you can go here...
Something is not right. This message is just to keep things from messing up down the road