Little Gasparilla Island finds

[saundersloth]

Howdy, I have two chunks of something that have been a hot topic of debate in my household, whether these finds are fossils or not. Both are porous (the smaller one only in that little divet, the larger one all around) and found on Little Gasparilla Island in Florida. Thank you for your patience with this amateur’s post.    

[Rockwood]

The first one is bone for sure, most likely marine mammal, maybe part of a vertebra.

Reduce the certainty level for the same on the second. 

[ClearLake]

The second one looks like a really worn fragment of an oyster to me (but I'm not holding it in my hand, so maybe it is a bone fragment), the first one is bone as already stated.  Now if your question was are they old enough, or mineralized enough to be fossils rather than recent, that is much more difficult to say.  The larger bone certainly has the nice darkened look to suggest it has been buried for a while.  

[abyssunder]

I agree with the above statements.