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- W2271946102 abstract "ABSTRACT The Lower to Middle Devonian redbeds, evaporites and carbonates of the Elk Point Group are widely distributed in western Canada. In the subsurface of the Interior Plains, they overlie rocks of Precambrian or Lower Paleozoic age with an erosional unconformity that includes considerable relief. The upper boundary of the Elk Point Group is drawn at the top of a thin, transgressive shale unit that is widely distributed in the subsurface of the southern Plains. In the northern part of the Interior Plains this shale unit is not present and the upper boundary coincides with the late Givetian hiatus. Because the Elk Point Group includes several economically important mineral deposits, geologists have described a relatively large number of map units, both formal and informal. In order to summarize the depositional history of the Elk Point Basin from a new perspective, the succession is subdivided into six informal units. Each unit resembles a depositional sequence and includes a nearshore detrital, an evaporitic, a carbonate, and a basinal shale facies. Some depositional sequences have a transgressive character, others are regressive. End_Page 172------------------------ The transgressive sequences onlap older paleotopographic or paleobathymetric high features. Prominent pre-Devonian high features are the Western Alberta Ridge, the Peace River Arch, the Tathlina Uplift and the Keele Arch. Prominent paleobathymetric features are reefal, and include the Presqu'ile Barrier, Ram River Reef complex and the Rainbow, Horn Plateau, Methy and Winnipegosis reefmounds. These features are surrounded by nearshore flank deposits or evaporites. The regressive sequences prograde seaward across the various basins and form laterally extensive carbonate platforms. The wedge composed of the Hume, Nahanni, Keg River and Winnipegosis formations is a prominent example. An analysis of the small- and large-scale sedimentation patterns in the Elk Point Basin suggests that the sediments and evaporites were deposited during a general relative rise in sea level. The general rise is punctuated by a large number of small-scale fluctuations, and three basin-wide falls. End_of_Record - Last_Page 173-------" @default.
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- W2271946102 date "1990-01-01" @default.
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- W2271946102 title "Elk Point Group Strata of the Western Canada Sedimentary Basin [Abstract]" @default.
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