The engraving is 3 inches long from the top of the head to the tip of the tail, and 1.75 inches tall from the top of the head to the bottom of the right foreleg. The fossil bone is a fragment from a long bone of a large mammal—most likely either a mammoth or mastodon. A mastodon carved into a mastodon bone? How meta!
13,000-year-old Ice Age art: a mammoth carved in bone - Science Codex