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upper Paleocene
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Mammalia
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Reptilia
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Brazeau Formation
Coal-bed methane potential of the Foothills in the Cadomin area, Alberta
Abstract A series of thin fault plates, lying in the Brazeau area of the central foothills of Alberta, are described. Developed at the surface in beds of the Upper Cretaceous Alberta group and Brazeau formation, they are folded as a group into several anticlines and synclines. This structure is attributed to two distinct periods of movement. It is shown that the disturbance causing the folding of the fault plates also formed Chungo anticline, the major structure of the Brazeau area. The folded fault system is found to extend throughout a large part of the adjoining foothills, indicating a widespread influence of the two episodes of movement. Many folded faults are found in other parts of the foothills and mountains and a similar tectonic history throughout is suggested. It is postulated that the entire foothills belt and at least the outer ranges of the Rocky Mountains were subjected to low-angle thrust faulting followed by large-scale folding with attendant thrust faulting. It is not suggested that these movements each occurred uniformly throughout the foothills and mountains; in the southern foothills there is some evidence of two periods of faulting prior to the major folding.
Folded Faults in Rocky Mountain Foothills of Alberta, Canada
The Cretaceous–Tertiary boundary In the central Alberta Foothills. I: Stratigraphy
En échelon geometry and two-dimensional model of the triangle zone, Grease Creek Syncline area, Alberta
Controls on the distribution of coal in the Campanian to Paleocene post-Wapiabi strata of the Rocky Mountain Foothills, Canada
Coals in the post-Wapiabi strata of the Rocky Mountain Foothills are found in the upper Campanian (uppermost Belly River and lowermost St. Mary River formations), lower Maastrichtian (upper Brazeau Formation) and lower Paleocene (upper Coalspur Formation) stratigraphic sequences. Large-scale facies relationships within these sequences, combined with sedimentologic data for the coal-bearing strata and their correlatives, indicate that the coal-forming swamps originated in marginal marine, marginal lacustrine, and flood-plain enviornments. The coal-forming swamps developed only when there was a combination of appropriate diastrophic and favorable climatic conditions. This happened twice in the depositional history of the Rocky Mountain Foothills during phases of relative tectonic quiescence (early Maastrichtian and early Paleocene) in the northern, humid part of the basin. At those times the semiarid conditions in the southern part of the basin precluded the formation of coal-forming swamps. The semiarid conditions in this part of the basin were overridden in the late Campanian by the influence of the Bearpaw Sea, which led to the formation of thin coals in the marginal marine environment.