Prismatic blade core example in GR.

A. Prismatic blade core (#61) (dolerite) showing a change of direction in the knapping. 1. First striking platform and exploitation surface. Afterwards the core was rotated in order to continue the blade production. 2. Second and third striking platform (opposed) and knapping surface. B. Three dolerite blade blanks that could correspond to a prismatic core as example #61. 2. Is an overshoot.