||The Manitoba Lowlands are underlain principally by sedimentary rocks of Paleozoic age that constitutes the northeastern flank of the Williston Basin, a major sedimentary basin centred in northeastern North Dakota. Below the surface, the Paleozoic strata dip progressively southwest towards the center of the Williston Basin, to a depth of 2300m.
Paleozoic strata consist almost entirely of dolomite, limestone and dolomitic limestone with minor clay, limestone and/or sandy intervals. The Paleozoic formations are overlain with marked angular unconformity by younger Mesozoic strata that progressively overstep Paleozoic strata to rest directly on Precambrian basement.
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