Need the definitive ID of vertebrate fossil

[GroundLevel]

Hey FFFriends-

 

I basically joined because I found this while kicking around tidepools on Agate Beach in Northern California.  It was 50 feet from a whale carcass, so I think I just assumed for sake of size and locale it was a caudal vertebra from a whale.  The find was obscured from years of tide pool living (kelp, worms, coralline algae), so after some delicate work I finally got it cleaned.  Now I am less sure it's a vertebra.  Can anyone help either confirm its origin in a Cenozoic whale tail, or is it something like a whale humerus shorn of its ball socket?  A big stubby vestigial radius or ulna?  Or a more terrestrial megafauna fossil? Please help!

 

 

 

I have more angles, just let me know

[Miocene_Mason]

Well it's proximity to a recent corpse does not necessarily mean that it is of the same species. It does to me look like a vertabra although I'm not sure if it's a fossil or just old, you can hold it over a flame and if it smells like burnt hair it's not a fossil,  if it doesn't smell it's a fossil. Also, is it heavy for its size? I don't know much about the area, so I will not take a guess on what it could be.

[fossilized6s]

Looks like a partial vert to me. 

 

Can you please provide more straight on pictures of each "end".