Some of the earliest bone and antler spear-points such as these 35,000 year-old specimens in reindeer antler from the site of Abri Cellier, France have a split base which was squeezed into the end of the spear. Most later spear-point types were hafted according to similar principles: the spear-point was either made to fit into a fork or was lashed onto an oblique surface at the end of the spear shaft. About 15,000 years ago, the Magdalenians invented a new form of projectile weapon, the barbed harpoon. Often intricately carved and decorated, these were nasty weapons that promoted bleeding and, like a modern fish hook, were held tenaciously in the prey animal's body by the angular barbs. All of these bone and antler weapon types have been shown by experiment to be deadly weapons.