Mazon creek nodule

[Godrel]

I bought a bunch of unopened mazon creek nodules at a rock and mineral show and one has just opened. But i am unsure what it could be. At first i was thinking jelly fish but as i kept looking i thought i could make out a jaw and eye (i may be seeing faces where none are though lol) any help identifying this would be very much appreciated! Thanks!

[Yoda]

Don’t think this is a jelly fish 

 

@Nimravis ??

[Pemphix]

Probably a single leaf ?