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?
The depth depends on the site.
The oldest will be at the bottom of a particular site. Mostly, the oldest has the finest craftsmanship and rarity as well.
Some sites can run very deep. The people that lived in them didn't really clean house... they just added new layers of dirt. After hundreds or thousands of years, that can get pretty deep.
