Welcome to Tnet ! You might try posting it in another of the sub forums on here ..whats it , or rock and gem, or some such - beautiful whatever it is !
I have more questions than answers. I will say this. It looks like a sliced concretion, and the center portion has been removed, revealing the chemical activity that was going on between the layers. Interesting, but we're not getting the full story.
1st - I noticed this was your very first post - so, Welcome Aboard Bjcannon! Take a look at Sub-Forums: Tennessee for information (i.e., clubs, etc.) directly related to your state.
2nd - I moved from Today's Finds! over to Forum: Rocks/Gems for more exposure.