The rough plowed field was finally replowed, and I've hunted it a few times since. There hasn't been alot of new material, but I was able to find these today.
It looks like it shattered in the firing, because the broken edge looks melted.I was wondering too if the flaking may have been damaged as well, because the notched area does look intentional. I was so excited when I found this piece. I've never found one like it before. I almost cried when I realized it was broken.