This study comprises a highly innovative body of research on the supply of raw materials in prehistoric Iberia. The archaeological assemblages from recently excavated sites in north-eastern Spain are clearly presented, as are the various methods for the characterisation of flints and the determination of geological origins. The study is important in terms of the new data provided on raw material supply at the end of the Upper Palaeolithic in Iberia and a reconstruction of mobility patterns and resource exploitation of hunter-gatherer groups during the Pleistocene/Holocene transition. Spanish text.