Rock formation

[flynn]

My son brought this over, wanting to know if I could find out what it is. I thought u could find out on my own so I didnt get the best pics for you guys, I couldn't find anything. It almost looks like and feels like flint but not sure. The layers are confusing, I want to think it might be vegetation but not sure of that either of course. Any help would be appreciated.

 

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[sailaway]

this might help
https://geology.com/articles/geodes/
Thunder Egg | Geology Page
https://sciencing.com/tell-difference-between-geode-nodule-7634451.html

 

[Back-of-the-boat]

Looks like a fossil egg of some type.

 

[Yak1366]

Cool find, congrats!!

 

[pghDFXer]

Looks like a petrified birch mushroom, tinder mushroom or artists conch, or something like that.

 

[A2coins]

2nd pic looks like a face two eyes and the mouth cool find

 

[Gene Mean]

The growth rings say veggie to me but then again it looks like a dinosaur egg.

 

[Professor of Engineering]

Very interesting find!