The following paper addresses the study of those knapping processes occurred during the middle Holocene in Laguna de los Pampas (Central Pampean Dunefields, Buenos Aires), carried out through tecnomorphologic and technological (chaînes opératoires) studies of the lithic artifacts recovered in the surface of the Sector 2. The results obtained points to the employ of a wide diversity of raw materials, which sources are located at least 170 km away from the site, and among which stands the orthoquartzites and cherts from Tandilia. For these two rocks, as well as for the silicified dolomite, a direct acquisition is proposed. The production of blanks was mainly made by the unipolar and centripetal débitage. The presence of dull edges, reactivation flakes and exhausted cores, as well as the employment of the bipolar reduction, suggest an optimization in the exploitation of rocks. [ABSTRACT FROM AUTHOR]