Illinois Creek Fossil

[TheLittleMan]

My son found this while we were looking through a creed for anything interesting. My first impression is fossilized honeycomb, but I’m new to the hobby. Any thoughts?

 

[Charlie P. (NY)]

I think it's a form of sponge. Some of the earliest multi-celled life.

 

[Siwash]

Recepticulus, I think it's called and common to Illinois. Very nice looking stuff.