Carbide studded track on snowmobile did that
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Carbide studded track on snowmobile did that
Farmers plant Rye as a Winter ground cover down here in Norfolk County so I would go with that to explain the "green stuff".
If that rock was on a well used trail then I would go with snowmobile track making scratches as I've seen regulated/marked snowmobile trails on many farms here in Norfolk County. You might be able to get a local trail map and see if it's on the same land ?