From Smithsonian Magazine story by Lorraine Boissoneault, JAN 31, 2017

“The earliest bone to show distinct human-made marks—a horse jaw, sawed by a stone tool that indicates the hunter was attempting to remove the tongue—dates to 24,000 years ago.

The horse mandible was the most exciting find for Canadian scientist Lauriane Bourgeon. It bears multiple straight cuts, very similar to those made by stone tools and distinct in shape from marks made by carnivore teeth and natural abrasion. Additionally, the cuts match the patterns that would be created from butchering the horse. Altogether, Bourgeon says, the marks on the bone fulfill multiple criteria that would classify them as having a cultural origin, whereas it would be hard to explain their existence by natural processes.”

Read more: Horse Mandible rewrites human history in North America