Carboniferous gastropod?

[Fullux]

Howdy all,

 

Was taking a walk around EP. Tom Sawyer here in Louisville, and I found this little fossilized gastropod in a creek bed. I had originally thought that it was of the Silurian, but then I found some coal right next to it, which makes me think this may be Carboniferous.

 

A species ID would also be helpful.

[Fullux]

Here's the pieces of coal I found as well as some other fossils I found.