1. Memoria explicativa de la plancha 227 La Mesa, escala 1:100.000;Acosta,2001
2. Informe Geológico Sobre los Yacimientos de Hierro, Carbón y Caliza de la Región de Paz del Río;Alvarado,1944
3. Marine Miocene and related deposits of North Colombia;Anderson;Proceedings of the California Academy of Sciences,1929
4. Clastic deposition, provenance, and sequence of Andean thrusting in the frontal Eastern Cordillera and Llanos foreland basin of Colombia;Bande;Geological Society of America Bulletin,2012
5. Geology of the Central Western Cordillera, West of Buga and Roldanillo, Colombia;Barrero,1979