MARTÍNEZ , J. l. 1995. “Microfossils of the Guadalupe Group and the Guaduas Formation (campaniano-Maastrichtlano) in the Tausa Section, Cundinamarca, Colombia”. CT&F - Ciencia, Tecnología Y Futuro 1 (1):65-81. https://doi.org/10.29047/01225383.608.