Abstract
Mississippian rocks of southern Saskatchewan comprise in descending order, the Charles, Mission Canyon, Lodgepole, and Bakken formations. However, in the Wood Mountain area of southwestern Saskatchewan, the Charles is absent as a result of pre-Jurassic erosion and at Carievale, in southeastern Saskatchewan, only the basal anhydrite bed of the Charles has been preserved. Cyclically deposited chalk, oolitic limestone, and bioclastic limestone comprise the Mission Canyon formation which may be subdivided into six members. The Lodgepole comprises argillaceous limestone, dense siliceous limestone, primary chert, and calcareous shale. The Bakken formation consists of two black bituminous shale members with intervening siltstone. The origin of the various rock types is an outgrowth of this study, and criteria are presented for the recognition of evaporitic dolomite. Differential weathering of the chalk members, as compared with the much harder limestone and evaporitic dolomite units, probably has a marked influence on the topography of the erosion surface of the Mississippian sub-crop. End_of_Article - Last_Page 422------------
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