The sub-Cretaceous unconformity is a major component of the three-dimensional geological model of Alberta. This dataset is a two-and-a-half (2.5D) dimensional grid surface of the sub-Cretaceous unconformity paleotopography in west-central Alberta. To create this grid, stratigraphic picks of the sub-Cretaceous unconformity were geostatistically analyzed and interpolated to model the unconformity surface elevation. A grid of the dominant regional trend was created and subtracted from the elevation grid, creating a residual grid that is a representation of the sub-Cretaceous unconformity paleotopography. This grid has been clipped by the study area boundary.
The study area covers NTS map sheets 83G, 83J, 83K, and parts of 83F. The southwestern limit of the study area is defined by the approximate limit of the main Cordilleran deformation.
Peterson, J.T. (2017): Sub-Cretaceous unconformity paleotopography, west-central Alberta (gridded data, ASCII format); Alberta Energy Regulator, AER/AGS Digital Data 2017-0004.