캐나다
Quaternary geology and bedrock subcrop of the Cold Lake to Ft. McMurray area, Alberta - Surface structure, Grand Rapids Fm. - (1:250,000 scale gridded data)
A digital grid of the top of the Grand Rapids Formation, originally modeled from borehole data and adjusted to present-day and paleo river erosion. The grid is generated at a 250 m cell-size resolution, based on information as recent as 2003.