Picked up a few little Muncie Creek nodules, just for something to do. Expecting (or at least hoping) to find some conularia, they were all pretty much a bust, except this one.
It was a very small nodule, but has a very distinct something inside.
It really looks like shell, but the 'tri-hull' shape and the amount of apparent growth lines is kind of throwing me. But then, I know very little other than the most common stuff.
Any ideas?
A sort of panoramic view:
Thank you!
Steve