Sub-Cretaceous Unconformity Paleotopography, Lower Athabasca Region, Alberta (gridded data, ASCII format)

The sub-Cretaceous unconformity is a major component of the three-dimensional geological model of Alberta. This dataset is a two-and-a-half dimensional (2.5D) grid surface of the sub-Cretaceous unconformity paleotopography for the Lower Athabasca region of Alberta. The study area covers NTS map sheets 73M, 74D, 83P, and 84A.

To create this grid, stratigraphic picks of the top 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. The grid was then clipped by the study area boundary.