Conularia

Here is an odd creature that no one quite knows what it really looked like. It left a skeleton that is in the shape of a four sided pyramid with a lot of grooved lines on it. Some think it might be some sort of jellyfish but they have been found with stems.

Maybe some type of crinoid. It is called a Conularia and existed in the Mississippian time period. I believe this one was found in southern Louisville.