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I was tilling my back garden when about 8 inches below the surface i cam across a strip of blue stone which cute across my garden. It’s just about 5 slabs across, equaling the width of the house, located about about 30 feet from my foundation. Is this som sort of erosion control? There is no brick or anything below the stone. There were also to peices in one corner standing on it’s side and held in place with really old iron spikes. I can’t find any drainage pipes etc so i’m a bit confused as to what i just found. I’d like to use the stone for a patio in the back if i can as i just pulled up about 2 tons of crappy old cement which was covered by about an inch of soil. TIA.