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As requested, here are some fossils found in concretions from the Pennsylvanian Muncie Creek Shale.... Two conularids and some chitin, possibly from a crustacean: Crustaceans are occasionally found: The phyllocarid shrimp Concavicaris is the most common. The two nodules on the left contain its spiky telson. At top and lower right, its carapace can be seen. The nodule in the middle with the fly-like form may be a shrimp tail. The nodule in the upper right appears to contain chitin. There appears to be a curled-up shrimp in there, but I'm not sure. Ammonoids are found too. The square-edged Proudenites seems to be the most common: A suture pattern is visible in the one at the bottom. Fish material is quite common: Most are bones and spines that are hard to id. Occasionally, one is recognizable. The mandible on the left, for instance. I call these 'chicken bones': This distinctive form has bilateral symmetry. I'm not sure where it would fit into a fish. A piece of another 'chicken bone', and a scale: And finally, the coprolites: Bones and scales pass straight through a fish. That big bone on the right must have been painful....

Phosphatic concretion, Muncie Creek Shale, Kasimovian/Missourian Stage, Pennsylvanian Kansas City metro, KS/MO, USA I'm pretty sure this is a mollusk. The fine striations remind me of those on some Poterioceras: Any ideas?

I found this oddity on Point Pleasant Beach, NJ last weekend. The 5-point symmetry suggests an echinoderm but the black, phosphatic preservation suggests anything but. Any thoughts?