Please help identify this fossil

[Squiddiddly]

I was rock hunting around the Kansas river and found these in an area with a lot of rock that came from a quarry somewhere in the area. They were found around a lot of crinoids, coral, and brachiopods. I thought they might be some kind of coral but wasn’t sure. The one on the right looked similar to the left before I used vinegar to dissolve some limestone. Any help is appreciated!

Edited yesterday at 01:35 AM by Squiddiddly

[Fossildude19]

These do not look like fossils, to me.
These look like minerals or concretions.  Geologic in nature, at least.

Not fossils.

[doushantuo]

I agree with Tim...

too little to go on to invoke a biogenic origin.

 

[Squiddiddly]

Edit: I dissolved the second one in some vinegar and noticed that the surface of what didn’t dissolve had a unique texture. Upon further inspection I noticed that both have a different texture on the rings around the face of the rock. 

[DAS_Rex]

Looks like a type of bryozoan or coral to me. The pattern and texturing remind me of ones that I’ve seen. The pics of the cleaned specimens definitely show a pattern. I’m not very knowledgeable on coral and bryozoan types, but I’d start there.