This chronological evolutive phase of the Magdalenian cultures developed during the Ancient Dryas (13,500/15,500 BCE). In terms of equipment, it is characterised by the major development, even abundance, of bone tools, including spear-throwers, perforated batons, half-round rods, needles, spear points and so on. The unprecedented use of deer bone and antlers was accompanied by the development of mobiliary art in a variety of media. Known for the realism of its figurative representations (particularly animals), the art of engraving, sculpture and sculpture in the round reached its peak in this period. Rock art in rock shelters or caves also developed to its greatest extent since the Aurignacian, particularly in southwest France, the Pyrenees and on the Cantabrian coast. There were growing regional differences despite permanent and repeated contact between regional groups.