Hi esteemed forum members,
I have several finds I need help identifying, but I'm going to do them in separate posts/threads/topics/whatever.
I found this one in some Burlington Limestone in central Missouri. It's super brittle. You can see areas where pieces have just flaked off. The lines you see going across the front of it are raised.
The leading theory on this so far is that it's a Rhodocrinites calyx that flattened during diagenesis. I've also attached an image of the small matrix it came off of (I found the calyx, if that's what it is, in situ unattached, just laying there on top of the matrix).
Let me know. And stay tuned for other, and probably less exciting, ID requests. Thanks!