Last weekend on a dive in emerald i noticed what appeared to be a circular millstone on the floor headed upstream just to the left of the do not enter sign. Upon exit my dive buddy brushed many years of silt off the surface of the stone and we observed the date 10/22/86 and the initials J.G. engraved in the stone...any ideas or knowledge as to what this represents or how the stone got there? Bill Huth


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