Help ID marine fossil? Sponge?

[AshNBone]

Hello again Fossil friends! I have another fossil I need help with.  Found with other shell and coral fossils in a river shore in north eastern Kansas, most likely Pennsylvanian. It looks to be maybe a sponge with exterior and interior... structure? Couldn't figure this one out. Maybe someone with more knowledge can ID it for sure.

[AshNBone]

It's a sbout 3 x 2 cm funky cylinder

Edited February 9, 2021 by AshNBone
Size

[Fossildude19]

Not really seeing anything indicating this is a sponge. (Granted, not my strong point.) 

Wait for some other opinions, though.

 

@TqB  @Tidgy's Dad

[AshNBone]

5 minutes ago, Fossildude19 said:

Not really seeing anything indicating this is a sponge. (Granted, not my strong point.) 

Wait for some other opinions, though.

 

@TqB  @Tidgy's Dad

No idea what it is, closest I could think of from looking at other fossils is possibly a sponge. But I'm def no expert either. Maybe not even a fossil and just a really really funky geology. 

[Rockwood]

Cephalopod shells have a complex chambered structure.

[Tidgy's Dad]

I don't think it's a sponge either. 

Bits of it look a little like the internal structure of a brachiopod, cardinal process, crura, crural processes, maybe some sort of brachidia. 

But there seems to be too much of it, and some pieces don't seem to fit.

Then again, I have Brachiopod Pareidolia. 

[Thomas.Dodson]

I'll echo the not sponge comment. I don't really have a good idea on what it is but I'd guess it's geologic. That could be my anti-pareidolia though.

[IsaacTheFossilMan]

I think it's a Chambersaurus Rex skull... More seriously - the anti-pareidolia is switched on in me, I second Thomas.