KsKingBee, I have about 3 inches or less of topsoil that sets on solid limestone. I carve my postholes with a sledge and rock-bar. It does bring back a memory of a friend of mine and fellow railroad worker. He also had a small farm and had the same trouble with rock, when making fence post holes. He got irritated in trying to get a hole made for a yard light in his pasture. One of our older fellow workers suggested that he use dynamite and blast a hole. This was back in the 1960's and many farmer's used a part of a stick of dynamite and some ammonium fertilizer, soaked in diesel fuel, to blast out tree stumps. As he needed a deep hole, he used a full stick of dynamite and a 50 pound sack of fertilizer. To make a long story shorter, there is a good sized pond now, where he had intended of putting a yard-light.
