Help with a bone chunk

[Jim Kovalchick]

I'm not expecting much on an identification on this one. I'm more interested in understanding if there is a way to determine if a bone chunk is from a marine mammal such as a whale, porpoise, and sea cow, or if it is from a land animal.

I am attaching a picture of a chunk of beach bone. I dont normally keep unidentifiable bone, but some about the nice color and density made keep this one.

It is about 5 inches at its longest and a couple inches thick. One side is flat and smooth. Another side is broken in cross section and lighter colored. The grain in the cross section is dense.

 

If anyone has some thoughts on generally what it may be or even may not be, I would appreciate it.

[Jim Kovalchick]

[Jim Kovalchick]

Pic 2

[Jim Kovalchick]

Pic 3