The article presents the results of a technical and technological study of organic and inorganic microstates on the surface of stone artefacts lying in the Early Mesolithic layer of the Dvoinaya Cave (North-West Caucasus). Based on microchemical and IR spectroscopic analyses, organic substances of plant and animal origin, as well as mineral components, were determined. The presence of organic residues on the tool blades is consistent with the functional determinations obtained using the tracological analysis performed earlier. Keywords: Mesolithic, Northwest Caucasus, stone tools, organic remains, microchemical analysis, IR spectroscopy, tracology. Introduction The Dvoinaya Cave is located in the Guba Gorge in the Northwestern Caucasus and has been studied since 2007 under the guidance of E. V. Leonova (Leonova and Alexandrova, 2012; Leonova, 2014). To date, three cultural layers with their own structural features and differences in stone inventory have been identified on the monument (Leonova et al., 2013). Materials from the Early Mesolithic cultural layer of the Dvoyaya Cave (lithological layer 6) were used for the study. At the moment, the museum's collection includes more than 3,700 stone products. In the course of tracological study, a significant amount of residues of substances of different morphology and color was found on the surface of the tools. Such remains (20 % of the number of artefacts studied by the trace method) were recorded on 153 stone objects (Alexandrova, 2014). Their organic origin has been suggested*. The work was carried out within the framework of the Program of the Presidium of the Russian Academy of Sciences "Traditions and Innovations" and the RFBR project N 12 - 06 - 00202-a. *All the finds were washed in water with a soft brush during on-site processing. Immediately before performing the analysis under a microscope, the surface of stone tools was treated with alcohol. page 2 By shape, color, and location, the remains are divided in ... Read more