Fossil or just a rock?

[Hendrix]

It is about 1.75" long. Rock or fossil?

 

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[Limitool]

For what its worth I'm going with a fossil. To much going on to be a natural rock (so I say).

 

[DizzyDigger]

Can't decide either way...but it's a cool find!

 

[ConceptualizedNetherlandr]

Vinegar makes it fizz?

 

[Hendrix]

Vinegar makes it fizz?

Just tried it and it doesn't fizz.

 

[ConceptualizedNetherlandr]

Where did it come from? Stratographic info?