During the Aurignacian and Gravetian, the morphology of hunting lithic points is conditioned by the use of abrupt retouch. However, in the Solutrian, the hunting tools change radically and for about 5,000 years the systematic use of flat, invasive and bifacial retouch will characterise the different projectile points.
The appearance of flat retouched points in the Lower and Middle Solutrian could be explained by the generalised use of the propellant. The appearance of points with different modifications to facilitate their insertion in the Upper Solutrian would be related to the appearance of the bow as a new propulsion system for these projectiles.

