Help Id Fossilized (Animal?) Bone.

[brainfogbetty]

I found this while tilling up my garden a few weeks ago. I thought it was a rock until I washed it off and removed

all the packed dirt. I know nothing about fossils, but I thought it was unusual enough ( for me) to save and

try to ID it. I hope these photos are clear enough to see. It's got a real smooth ridge on one side.

I found this in lower SE MI.

Thanks in advance.

B.