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Full-Text Articles in Stratigraphy
Allostratigraphy Of The Lower Colorado Group (Cretaceous) In South-West Alberta, Slavena Galic
Allostratigraphy Of The Lower Colorado Group (Cretaceous) In South-West Alberta, Slavena Galic
Electronic Thesis and Dissertation Repository
Clastic, upper Albian-lower Cenomanian strata were deposited in a low-accommodation backbulge depozone of the Western Canada Foreland Basin in SW Alberta. These strata are lithologically very heterogeneous and encompass a spectrum of depositional environments along an alluvial to offshore transect. These rocks are assigned, in subsurface, to the Lower Colorado Group, and in outcrop to the upper Blairmore Group. Lithological heterogeneity, as a result of rapid lateral facies changes, resulted in diverse nomenclature that obscured genetic relationships between time-equivalent strata. The present study integrates wireline log, core, and outcrop data to establish a high-resolution allostratigraphic framework which allowed recognition of …
High-Resolution Allostratigraphy And Sedimentology Of Santonian - Early Campanian Wapiabi Formation In Southern Alberta, Western Canada Foreland Basin, El Mahadia I. Mohammed
High-Resolution Allostratigraphy And Sedimentology Of Santonian - Early Campanian Wapiabi Formation In Southern Alberta, Western Canada Foreland Basin, El Mahadia I. Mohammed
Electronic Thesis and Dissertation Repository
Within a 90,000 km2 study area in SW Alberta, Santonian – basal Campanian strata of the upper Wapiabi Formation are dominated by marine rocks that thin westward from ~300 ~180 m over ~300 km, reflecting apparently spatially uniform flexural subsidence driven by the static load of the orogen. A high-resolution allostratigraphic framework established ten allomembers grouped in four informal tectono-stratigraphic ‘units’, three of which were previously recognized in NW Alberta. In the north and east, the formation is dominated by mudstone organized in numerous metre-scale siltier- and sandier-upward parasequences. A lack of clinoforms and abundant wave-formed sedimentary structures suggest that …