Fossil or rock?

[Flygirl_osu]

I picked up two items from Casperson Beach in Florida (along with TONS of

fossilized shark teeth). 

There is a Pleistocene boneyard offshore, so I'm not sure if this is a bone fossil or a rock.  It is much lighter than a rock this size should be, and porous.  There is an indentation on one side (see larger pic in collage).

[Flygirl_osu]

Here is a collage with pictures  of the second object I picked up.

Edited February 4, 2017 by Flygirl_osu

[TNCollector]

These both appear to very worn bone fragments to me, likely fossils. Unfortunately, I highly doubt that these can be narrowed down to anything other than mammal due to how eroded they are.

 

Nice finds though! Florida has a lot to offer to fossil enthusiasts.