I thought about them finding a skull but no other bones, so I went to Google maps, wondering what kind of terrain we were looking at here (residential, farmland, etc). There are several years on Google maps and different seasons, for this area. Definitely looks like remote, rural farmland, one year there was corn in the fields. Based on how it appears to be used, and the possible long length of time, it's possible those bones are long gone due to plowing and predation. Finding only a skull may not indicate cause of death, or dismemberment.