What mamal did this vertebrae come from?

I found it on Stinson Beach, which is one hour north of San Francisco across from Bolinas.

Post's pictures

IMG_2824.JPG, 336.02 kb, 1280 x 960

IMG_2825.JPG, 286.9 kb, 1280 x 960

sorry but it is almost impossible to say much given how worn and incomplete the bone is.