About 20-25 of these were found in an tobacco patch after the guy plowed it deeper than it had ever been plowed. The area is a high shallow, and for this area, flat hollow with a lot of springs on each side. Camp area? It brings up the question of how deep in the ground the good stuff rests?
On the depth question
I test that with a landowner. We took a shovel and dug a couple of test pits in the hottest of the hottest center of the best part of the "site".
A post hole. Top soil was 15-18" deep. Then we hit a red clay layer. That intersect is where the flakes ceased. I'm thinking the place was initially a buffalo wallow that was panned out by the herds. Then the Indians moved in and started building organic matter from there.
