The Late Mesolithic flint assemblages, which were the object of detailed spatial studies, were selected from the material originating from trenches 4 and 7 of the site Nieborowa I in Lubelskie voivodeship. There they formed small compact flint concentrations measuring 4-5 m in diameter. These assemblages are numbered among the non-trapezoid classic assemblages of the Janislawice culture dated on typological grounds to the sixth millennium BC. To study the spatial patterns, it was necessary to map the occurrence of semi-processed blades and flakes as well as of chips. A detailed planigraphy of the spatial distribution of tools and waste from their production was prepared, including refittings of modifications. Various areas of activity were distinguished in consequence: a concentration of production waste (flint knapping area) and two concentrations of tools, one in the north and the other in the south (areas of household activity). In the flint-knapping area, apart from products of core exploitation, two sets of microburins were noted, relative to two separate areas of points manufacture, as indicated by the refittings of points on microburins or the microburins themselves. Two separate areas of microlithic production pointed to the existence of two separate, but parallel series of blade exploitation. The features distinguishing areas of household activity from the flint-knapping area include fireplaces (flint concentration A in trench 4) and the scattering of tools over an area of a few dozen square meters, as a result of which they do not form compact concentrations. Also the count of these tools (points, for example) is considerably bigger as compared to that from the flint-knapping area; this is undoubtedly due to their being used and modified. Further, the refitting lines which do not connect the individual tool concentrations would also suggest that we are dealing with two separate settlement events. The chronological relation between the areas of household activity remains to be determined. Sites of Maglemose culture and the Mesolithic site of Mokracz investigated by E. Niesiolowska-Sreniowska have been interpreted on the grounds of a spatial analysis as base amps inhabited by two families concurrently. It seems that the Nieborowa site represents a similar model of social structure. The respective figures present an interpretation of the spatial organization of Janislawice-culture base camps. The spatial pattern repeatability was determined for the flint concentrations analyzed in trenches 4 and 7 on the Nieborowa I site. The model is characterized by the co-occurrence of two areas of household activity, represented by tool concentrations, and separated by a flint-knapping area. It would suggest that each time around the social groups in question organized space inside their base camps in much the same way.
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