Hey bigjohnnyblue, you've got some nice pieces, all the more if found in just a couple of different acreages.. Especially the number of hard stone artifacts you have. Underneath the picture of the "Thebes " knife is what looks to me like a small Celt with a double beveled edge. If that's the case can you show more pictures? I'm quite interested for I have one very similar.
P.S. If you haven't found an answer for the stone platform piece your son found by the creek, there will be a huge artifact show in Collinsville,iL March7th &8th if you would be interested. Don't sell that piece until you know for sure what it is. It may may not be an Indian artifact, but if it is it could be worth more than you may imagine. I've been around the block a few times with elite pieces, just saying, don't sell it to anyone until you know exactly what it is. Even if it's just an old stone carved inkwell, which would still be pretty cool!