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My theory is that these were grain threshing areas in a time when the climate was different. the Grain could have been Threshed and swept down the grooves to be collected (thats why they are on an incline,this area could also have been Covered,a soil sample of the area would ascertain what crops were growing at the time.similarly the smaller rock circles could have been used for either pigments,dyes,or even herbs separation or crushing like a pestal or mortar.The Ancients had very little time for non practical or non pragmatical use of Ancient Labour.From other Ancient sites in Burial, the crop circles, were a sign of plenty ,abundance ,rebirth and fertility, and why they were revered as they took this as cycles and cycle of life itself. This is my simple belief and I come from an Ancient Celtic people.
Yours respectfully
George David Flynn
Dai Floin,O.Floin