Recognition of a Sequence Boundary at the top of the Mississippian Midale Beds, Williston Basin of southeast Saskatchewan;

The upper portion of the Midale Beds of southeast Saskatchewan were deposited in a Tidal Flat environment and show a great deal of variation in reservoir quality. They were vulnerable to erosion as a result of an extended period of exposure. Our model of deposition suggests that the carbonates prograded laterally as clinoforms and built up to sea level (Kent and Lake, 2012). The potential for preservation depends on the duration of exposure and the stability of the platform and sea level. This explains the thinning of the Midale Beds as we move eastwards from Weyburn Midale towards Steelman Pool (Lake. 2001).