It was found in the exact spot a large "preformed" Pre-Clovis/Clovis Era arrowhead was found. The picture makes the stone appear grayish-brown, but its color is jet black. Very thin, but flaking seems to be the same as the larger arrow head found near it.
Suz, points proximity in a drainage for identification would be just a tremendous coincidence.
Once any artifacts leave their ancestoral resting place ( like on the gental slope of a hill or drainage ) its like throwing fossils, minerals and
artifacts into a huge tumble dryer.