Awesome. How old are we talking?
?
Sure looks like a Full Grooved Axe to me. Congrats on the great find.
Here's a link with some info on them. They are basically considered Middle Archaic around 5,000 BC.
Looking at Prehistory: Indiana's Hoosier National Forest Region, 12,000 B.C. to 1650 (Middle Archaic Period 6,000 to 4,000 B.C.)

Prices on Axes vary greatly. I really nice high polished one, especially the Iowa Square types will bring big money and some as much as in the thousands I would say. I have seen decent Axes go for $25 to $40 dollars at auctions. One like yours would more than likely be in that range.
Prices on Axes vary greatly. I really nice high polished one, especially the Iowa Square types will bring big money and some as much as in the thousands I would say. I have seen decent Axes go for $25 to $40 dollars at auctions. One like yours would more than likely be in that range.