During the excavations of a cemetery of the Cloche Grave Culture at Wieliszew (T. Węgrzynowicz 2006) a series of 18 chipped flint artefacts was unearthed at different depths, mainly from the illuvial layer. 16 specimens are of chocolate flint and 2 of erratic Cretaceous flint. As much as 14 items bear traces of having been burnt. Two components can be tentatively distinguished within the series. The first, more numerous, comprises mainly blades and fragments of blades (Fig. 1:1, 2), as well as a poor end-scraper superimposed over a burin (Fig. 1:3) and a fragment of a retouched blade. Some of the blades are from opposed-platform cores (Fig. 1:1), a technical trait that, together with the dimensions of the pieces, enables us to attribute them to the Final Paleolithic Masovian (Swiderian) tradition. The second component is represented by as few as four pieces, but they are more culture-specific: a single-platform subconical core (Fig. 1:5), a thermal fragment of a microlithic core, a bi-pointed backed bladelet of the Stawinoga type (Fig. 1:4), and an adze or proto-axe (Fig. 1:6). The Stawinoga point is characteristic for the Komornica Culture, from an earlier part of the Mesolithic Period. As for the adze, on the Polish Plain it is a tool-type linked with the adaptation of the Mesolithic communities to the forest environment (cf M. Kobusiewicz 1973). Both assemblages are obviously incomplete and in disturbed position, which is due, among other things, to the digging of the grave pits. The collection completes the rich Stone Age materials from the area of the lower Narev river, gathered and excavated in the years 1955–1963 (H. Więckowska 1985)