Depositional patterns and oil field trends in the Lower Mesozoic of the northern Williston Basin, Canada

  • Christopher J
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The Early Mesozoic depositional sellin& of (be Williston Basin went through several phases following termination of the vast Paleozoic marine systems by the epeirogeny following the Appalachian oroteoy. Severe contraction of the Basin OC:· curred in the Triassic, as indicated by the disuibution or the upper Spearfish-Lower Watrous and the Amaranth red·beds and evaporites. At that time, the basin was made up of two trapezoidal troughs: one trended northwest into Saskalchcwan from an intersection in North Dakota with tbe other, which ex· tended northeast form Wyoming to lOUthw= Manitoba (The Amasanth sub-basin). Structural blocks flanking this Triassic basin exercised shore·maigin controls on sedimenta· tion formau of the succeeding marine Jurassic basins. Onshore flats dominated the Triassic depositional floor of cont.incntal to masine red-bed clastics and evaporites. These were succeeded by Middle Jurassic duper water scdimcnta· tion, that progressed from sabkha-like bodies to off shore marine, as sun in the Upper Watrous, Oravelboura. and Shaunavon Formations (piper Group). Ma.x!mum expansion of the basin occurred during the Rierdon and Swift epiJodes of deposition; this was aec:ompanied by uplifts of the Swe

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  • J E Christopher

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