Geological and microbiological information was gathered in order to identify the potential relationships between minerals and/or chemical elements contents in the sparse biomicrite, a sandstone and a mudstone with bacterial communities that were cultivated from a" scrapped off" made on each of these lithologies which were sampled on the Cretaceous sedimentary sequence of the Churuvita Formation (Road Tunja-Villa de Leyva). Three types of evaluations were made on each of these sample rocks: quantitative mineralogy was
