Integration of data from reflection seismic, borehole geophysical logs, lithology, and foraminiferal biostratigraphy revealed the need to revise previous stratigraphic correlations of Barremian to Albian strata in the subsurface of the south Mackenzie Delta and in the vicinity of Parsons Lake, Northwest Territories.

This study encompassess the area from about latitude 65° N to the Beaufort Sea and from longitude 132° W to the Alaska border, and includes Cretaceous strata in the northern Richardson, northern Ogilvie and British mountains, and in the subsurface under the Mackenzie Delta and Tuktoyaktuk Peninsula.