Deformation of stromatolites were studied in metalimestones of the Itaiacoca Group (Ribeira Belt), at three outcrops located on the south of Itapeva, Sao Paulo, Brazil, with qualitative and quantitative methods. Among the stromatolites identified, we used the Conophyton on the study of the deformation, since the initial parameters are known. Different shape patterns of Conophyton found in several localities are related with the depositional environment and differences of preservation, mainly caused by deformation. The thickest lenses and beds, with larger concentration of stromatolites, are better preserved. In the Lavrinhas quarry, the stromatolites have well-defined margins and well-preserved lamination however the contrast is extinguishes on most samples due to the dolomitization/ recristalization of the metadolostones. Although in the metalimestones of the Indumine/Chiquinho of Barros quarries, the preservation of the stromatolitic lamination is commonly well-preserved, besides the columns are deformed, showing that the columns resisted to the deformation in a more rigid way than the intercolumnar sediment, with relative movements between them. They develop an intercolumnar foliation. The medium value of R s = 1,34 in the metadolostones of Lavrinhas is similar that the values of R s found in rocks of the Lajeado Subgroup (between 1,31 and 1,91), towards southeast of the analyzed localities. In Indumine the value of R s is higher (1,91) than those found in metalimestones of the Lajeado Subgroup. Therefore, the value of R s obtained for the metadolostones can be considered as a close value to the metalimestone´s medium value of the Grupo Itaiacoca, and the value of R s of Indumine is a restricted to this locality. The differences according to deformation patterns of these two lithologies are related to the distinct tectonic behavior of the more pure and competent metadolostones than the more argillaceous metalimestones, which has a more plastic behavior.