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During the Late Devonian North America was at near equatorial latitudes and a system of attached and isolated carbonate platforms developed in western Canada. Our research has centered on the SE margins of two isolated platforms in western Alberta. Miette was approximately 165 km2 while Ancient Wall was substantially larger at about 1200 km2. Slope and basin successions are approximately 400 m thick. The red lines indicate the location of stratigraphic cross sections that I’ll illustrate and the red dots indicate the locations of slope and basin successions sampled for magnetic susceptibility.