Here is one even worse as far as building supplies goes. There was a small office in downtown Stevenson Al that had been owned at one time by a guy who had a bunch of land in the area. The story was he had excavated a mound on Long Island near Bridgeport and found so many arrow heads that he decided to use them as the filler in the concrete sidewalk to his office.
Imagine my surprise when I first saw this sidewalk ( in the mid 70s)with arrows heads embedded in the concrete, not broken ones but some really nice pieces, thousands of them. The sidewalk was probably made in the 50s when projectile points were so common people considered them a curiosity but nothing of value.
An old guy told me arrowheads were so common near Bridgeport and South Pittsburg he would pick up pockets full along the river and skip them across the water because they skipped much better than ordinary rocks.