Found in Martin Kentucky, Middle Pennsylvanian, Hayden Formation.
I thought I found a geode the other day so cut it open. The surrounding material got a somewhat mirror shine from the cutting tool (I assume iron rock). However when I hit it with a hammer and it cracked open I found this inside. It looks, to me, like a small fish or plant. I have no idea if this is even a fossil, so any help would be wonderful.
Thanks in advance.