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Integration of stratigraphic, structural, petrologic, seismic, well interpretation and biostratigraphic data<br>allow for a new interpretation for the Upper Cretaceous sequence of the Upper Magdalena<br>Valley. Thickness changes among similar depositional environments and between the Neiva<br>and Girardot Sub-basins (from 130-1300 ft respectively) allow us to constrain Maastrichtian<br>deformation, previous to Andean deformation.