Fish Maybe?

[nheikes]

I found this a couple years ago in Havanna Illinois in my daughters driveway. At fist I thought it was a fern, but I am pretty sure it's a fish.

 

[irbaddadjoe]

Cast of a Trilobyte

 

[Mackaydon]

I, too, thought trilobyte, but the middle ridge just doesn't look wide enough.

 

[Harry Pristis]

May be a conulariid (Phylum Conulariida) from the Mississippian bedrock of that area.

 

[Solius Symbiosus]

It appears to be a trilobite; I have a few conulariids from the Paleozoic that I haven't photographed, yet. I will throw them up in the future.

 

[nheikes]

Not a Trilobite - The actually rest of the spine comes out the top witch you can not see in the pic - I'll take another pic when i have time