Echeverri, S. et al. 2018. Correlation and Ar-Ar geochronology of the Cretaceous basement and the upper Eocene - Miocene (lower Aquitanian) sedimentary filling of the Tumaco forearc basin, southwest Colombia. Revista Mexicana de Ciencias Geológicas. 32, 2 (Jan. 2018), 179–189. DOI:https://doi.org/10.22201/cgeo.20072902e.2015.2.572.