Please help identify this. My guess is vertebra, perhaps dolphin or small whale. Thank you in advance for your comments!

Post's pictures

IMG_7689.JPG, 485.34 kb, 1632 x 1224

IMG_7690.JPG, 441.23 kb, 1632 x 1224

IMG_7691.JPG, 479.98 kb, 1632 x 1224

This is definitely mammalian, but rather than something marine, it looks more like a butchered cow lumbar vertebra based on the clean cut marks. I think someone may have had a bbq!