Something odd from the Cincinnatian

[TNGray]

Its not often that I find something unrecognizable from the Cincinnatian. This was found last month in the southern extension of the arch that outcrops around Nashville. Any ideas?

 

[Rockwood]

My record on these isn't the best, but I suspect it's a Chaetetid sponge.

[TNGray]

Thanks for the opinion. Sounds reasonable.