Marine Barremian deposits are represented in different lithostratigraphic units in Colombia, from the central part of the country to the north. Up to the Upper Magdalena Valley, continental deposits have been reported in the Yaví Formation; although until now, only Aptian plant remains have been recognized.Marine deposits include the shales and biomicrites of the Trincheras Formation to the west and southwest of Bogotá; the shales and biomicrites of the Fómeque Formation to the east and northeast of Bogotá; the biomicrites, biosparites, and shales of the Upper Calcareous Member of the Tibasosa Formation to the north of Bogotá; the shales and biomicrites of the Paja Formation near Villa de Leyva and to the northwest of Bogotá in the Middle Magdalena Valley; and in some cases, the biomicrites of the "Rosablanca" Formation.Sporadic occurrences of Barremian ammonites have been reported in the biomicrites of the Yuruma Formation, that occurs in northern Colombia near Venezuela; in the Cretácico del Río Cañas (La Guajira) deposits; and in the central and western regions of the Central Cordillera. Nevertheless, these have been poorly studied.Other lithostratigraphic units that have been cited as being related to the Barremian deposits, albeit without biostratigraphic support, are the Tibú-Mercedes Formation and, possibly, the Río Negro Formation. Barremian ammonites have been reported in the La Naveta Formation but with controversial stratigraphic control.Different fossil fauna and flora have been reported in these units, but ammonite biostratigraphy is the principal tool used to identify chronostratigraphic levels. Tethyan fauna allows one to correlate Barremian successions with standard biozones and biohorizons from the Mediterranean area, based on the Psilotissotia, Nicklesia, Pulchellia, Gerhardtia, Heinzia, etc.The sedimentary and ecological variations in the lithological units are the consequence of environmental factors, paleoecology, and basin differentiation that have recorded tectonic or subsidence influxes due to their local paleogeographic positions.