South American Archaeology Series No 13 The aim of this investigation is to evaluate, through technology, the mobility of hunter- gatherers who inhabited the northwest of Santa Cruz province (Patagonia, Argentina) during the late Holocene. Studying the technological aspects of the archaeological record recovered in areas with different ecological characteristics (low lake basins and high plateaux), the objective is not only to show its variability but also to explain it in relationship with the organization of groups living in specific climatic conditions.