Structure of Coleville-Buffalo Coulee Area, Saskatchewan
Contour maps, a paleogeological map, and cross sections are presented to demonstrate the structure of the area. Lower Paleozoic structure is briefly discussed. All structures observed in the uppermost Devonian and Lower Mississippian strata are attributed to leaching of a thick Upper Devonian anhydrite member with consequent collapse of overlying beds. The drainage pattern of an old land surface developed by a post-Mississippian erosional period is outlined, and all structures in the Cretaceous are shown to be the result of compaction and draping over this old land surface. The limitations this erosional unconformity place on seismic interpretations are explained. Unconformable contact between the Mississippian Coleville sand and Cretaceous shale probably accounts for the entrapment of oil in the sand.
Figures & Tables
As a result of the intensive search for oil and gas in western Canada, a regional meeting was held in 1955. This volume was the result of that meeting, and contains 23 papers divided between a discussion of the Jurassic and a discussion of the Carboniferous. Stratigraphy, subsurface, boundaries, formations, sedimentation and geology of western Canada and adjacent areas are thoroughly covered.