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This paper studies the different practices employed in the acquisition of woody material used by hunter–gatherer societies from the northwestern region of the Santa Cruz Province, Argentine Patagonia, during the early and middle Holocene. In addressing this theme, we study carbonized and non-carbonized wood recovered from six stratigraphic levels from the Cerro Casa de Piedra 7 site. This research revealed that during the lowest level of occupation, a distinct range of woody species were utilized; these were subsequently absent in the rest of the stratigraphical levels studied. In fact, all the other levels analyzed presented the homogeneous presence of a single plant species: Nothofagus pumilio. This species has the largest representation among both the charcoal and uncharred wood fragments of the six levels studied. The study of the assemblage samples allowed us to identify differences between the various archaeological levels, which could be the product of behavioral and/or environmental differences. [ABSTRACT FROM PUBLISHER]