Gotta love doing this

I could see a five or six inch diameter hole in the pavement. The small minimalistic two inch hole .. (picturing Rocky Squirrel telling Bullwinkle: 'Again?!?ÿ that trick never works!) .. just means you'll be digging it out wider once you find the iron.

At the depth we were going, it had to be about a 5 inch hole to accommodate pulling out a fist full of clay.  Found the stone with bars on the north and south sides (3-4 inch separation) marking the center east-west.