Our farm in SE Iowa had a large area that was a campsite and an area that was an obvious burial grounds. In the fall when plowing it was not uncommon to bring up remains. My Grandfather that owned the farm who was a half breed that left the western reservation that his family was sent to in 1910 as a young man, would walk the plowed grounds and gather the bones and other relics and rebury them along the creek that ran thru the farm. He was always afraid that if the area that he owned was identified as a burial grouds he would lose the farm. The farm was in the family until 1967 and I have a few items found there Russ