If a need were to arise to move a stone of that size, say building a road; it could be a good idea to drill a couple of holes into that soft limestone
to move it with a crane and rigging. Just a thought. Perhaps the last one remaining and it was so big they just left it in the median?
Turns out my memory is not as bad as I had thought. 17 1/2 inches just happens to be a common size for well drilling bits and core drill bits of that
size are also available.
I worked on oil rigs in my youth and I remembered correctly that the bits were 17 1/2 inches. These bits are also used to drill water wells and for
masonry work. They are tri-cone bits and the 17 1/2 inch size is what is normally used for oil and large water wells.
After a long absence from the ATS boards I return to find that this old post was still being discussed. Thank you for your answer. I think the drill
bit info nails this one down. Sounds like the stone was rip-rap dug up during the road construction that had been drilled through at an earlier time.
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