Final Paleolithic Masovian assemblages occur in small and compact concentrations. Two such concentrations were recorded in trench 4 and another one in trench 9. Spatial research was based on in-depth analysis of the differences in the count of blade and flake blanks and secondary refuse per square meter, as well as a detailed mapping of the distribution of tools and cores. Refttings of products was also carried out. Based on these procedures, it proved possible to identify within the concentrations specific areas where core processing processes took place. The time-spatial relations were then established between the products from the B concentration and the secondarily deposited refuse marked as C in trench 4. Four units with evidence of core processing waste and two from which such evidence was removed were identified in concentration B. Four main knapping areas were noted and two occasional ones, while the secondary refuse consisted of flint material from two of the main knapping sites. The flint concentration in trench 9 was composed of two adjoining knapping areas. The scatter of flint material and the refittings failed to show whether in trench 4 we are dealing with a single episode or two separate, superimposed incidences of habitation. In trench 4, tools were found only around the knapping areas; this concerns points in particular of which one fragment had found its way into the secondary refuse. This indicates that points were produced and damaged projectiles repaired in this area and not, for instance, around the fireplace. The fairly restricted tool kit in the two concentrations in trench 4, as well as no evident focal points for the deposition of tools which could suggest a functional differentiation of household activities, permit the assumption that the discussed remains concerned mainly flint procurement and processing. It is to be concluded that while the nature of settlement in the two flint concentrations is very similar, the spatial arrangement reflecting use of space inside the camp differs substantially. 18 Figures.