Type of geodized fossil?

[TwoOaks]

This was found on one of my recent hikes in a creek bed in south-central Indiana (Monroe County).  Geodes are very common finds as well as crinoid columnals and horn coral but this is the first find of this type.  So I would think it is some type of geodized fossil but would like the experts' opinions.  The first 3 photos (taken in natural sunlight) are "side" views and the 4th shows the "bottom".  What do you guys think?  Thanks in advance for your feedback.

[Tidgy's Dad]

A crinoid calyx, I think. 

The 'bottom' is the top. 

Nice find. 

Edited July 4, 2022 by Tidgy's Dad

[ScottBlooded]

39 minutes ago, Tidgy's Dad said:

A crinoid calyx, I think. 

The 'bottom' is the top. 

Nice find. 

I second that emotion. This is a very very cool crinoid calyx

[FossilNerd]

I agree with the others. Geodized crinoid bits are not uncommon in the Borden Formation here in Kentucky. I’ve found more than a few, but nothing as cool as yours. Good find!

 

[connorp]

In Monroe County this is probably from the Sanders Group. Lots of very nice geodes to be found in the creeks there. You can easily fill a 5 gallon bucket in an hour if you find a good spot.

[Harry Pristis]

For comparison: