This INVESTIGATION REPORT addresses the achievements of the Conservation and Restoration of Archaeological Features Project from Chalcatzingo (National Coordination of Conservation and Cultural Heritage [CNCPC] and INAH-Centre Morelos, both depending from the National Institute of Anthropology and History [INAH, México]). During this four-year project (2011-2014) research and intervention was carried out of the famous stone bas-reliefs that show the imprints ofthe Olmec culture in this archaeological site in the state of Morelos, Mexico. This contribution presents the results of the material study of the rock support --which include a bibliographic review of the geological context of the site and a petrographic characterization of the samples from some of the bas-reliefs—. After providing an assessment of the condition of deterioration of the carvings, it also describes —in chronological order— the interventions that were carried out in situ that focused on stabilization, preventive conservation and improvement of the environment of the archaeological monuments.