Some of the marks also look like cattle feed stations.
Look at this:
http://maps.google.co.uk/maps?q=milltimber&hl=en&ll=57.113016,-2.241863&spn=0.000763,0.002224&sll=53.617092,-2.351459&sspn=0.00667,0.017788&vpsrc=6&hnear=Milltimber,+Aberdeen,+United+Kingdom&t=h&z=19
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