1954. "Stratigraphy", Western Canada Sedimentary Basin: A Symposium; Sponsored by the Alberta Society of Petroleum Geologists, and the Saskatchewan Society of Petroleum Geologists, Leslie M. Clark
Download citation file:
The time interval represented by the sub-Devonian unconformity in the eastern Rocky Mountains varies considerably. The Devonian rests on Cambrian rocks in the south, but farther north, a thin sequence of unfossiliferous dolomites of uncertain age intervenes between the Cambrian and Devonian strata in the front ranges along and north of Bow River. Farther to the west, the Devonian overlies a sequence of Ordovician dolomites and quartzites of varying thickness and age. An early Ordovician (Canadian) fauna, characterized by Bellefontia and other trilobite genera, occurs widely, affording a useful horizon marker. A late Ordovician (Richmond) fauna occurs in the so- called Halysites beds and other Ordovician horizons may be represented. Little or no angular discordance is visible at the sub-Devonian contact and the magnitude of the break is evaluated from faunal and stratigraphic evidence. Study of the sub-Devonian unconformity may provide a clue to the loci of Devonian reef complexes.
Figures & Tables
Western Canada Sedimentary Basin: A Symposium; Sponsored by the Alberta Society of Petroleum Geologists, and the Saskatchewan Society of Petroleum Geologists
An enormous asymmetric structural and sedimentary basin with the deepest part along the eastern margin of the highly disturbed foothills belt of the Rocky Mountains, the Western Canada sedimentary basin is detailed in this volume. It consists of 30 papers dealing with the petroleum geology of the basin, with most of the papers deal with the area south of the Northwest Territories. The geological history of the area is covered, as well as topics such as: regional stratigraphic analysis, paleontological correlations, structural interpretations, folded faults, and the tar sands of Athabaska River.