I am leaning towards core sample or American Indian tool. and fishingpol , why might someone drill a sample core out here?
Mineral exploration....maybe looking for diamond rich kimberlite. http://www.wsgs.wyo.gov/research/minerals/Diamonds.aspx
Front (north) QUOTE="wildwest, post: 140757, member: 1396"] View attachment 27636 Entrance View attachment 27637 Looking to the right of entrance, garage this way behind the flag pole. I don't have a pic of the road being snowed over, it was down the road a few blocks.[/QUOTE] West Where the stone was found (south east)
Coal was my first thought but perhaps this also could be a property marker set by a surveyor. Graphite? But I like some of the other guesses guys gave too.