Hi, @gillian-catlett – this is a horn coral! A solitary coral that was pretty common in the early Paleozoic.
Here is the classification information: Kingdom Animalia, Phylum Cnidaria, Class Anthozoa, Order Stauriida. I don’t know that I can identify it down to the species level but at least that’s some more info for…[Read more]

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bivalve

Brachiopods. A brachiopod shell shows symmetry (equal left and right parts). A bivalve shell cannot be cut in identical left and right parts. Bivalve symmetry is between shells (the hinge). Usually the “beak” in a bivalve curves to one side.

thse are Ordovician brachiopods. Valandostophia poderosa.

oops yes a brachiopod I am always getting mixed up!

Hi there looks like crinoid stems & sections

Yup. Definitely crinoids

i agree, crinoids. as a kid i thought I’d found Indian beads but they were crinoids, both ate equally amazing

Yes crinoids

crinoid definitely

Hey @gillian-catlett ! This appears to be a crinoid stem segment or at least its external mold. Casey County has a number of formations which are of Mississippian age, so finding crinoids is not surprising.

my first thought was trilobite but looking closer I realised that it was a crinoid