The Pakowki Formation is a geological stratigraphic unit of Late Cretaceous age located in southern Alberta, Canada, within the Western Canada Sedimentary Basin. It was named for Pakowki Lake, a prominent landmark in the region.
Lithology
The formation is primarily composed of shale and siltstone, with occasional interbeds of sandstones and conglomerates. These sedimentary rocks record a marine to marginal‑marine depositional environment associated with the Late Cretaceous seaway that covered much of western North America.
Stratigraphic Relationships
In the regional stratigraphic framework, the Pakowki Formation overlies older Cretaceous units such as the Horseshoe Canyon Formation and is itself overlain by younger formations, including the Cardium Formation and Dinosaur Park Formation, depending on the specific locality. The formation is part of the Upper Cretaceous sequence that is important for hydrocarbon exploration in the area.
Geographic Extent
The formation is exposed and subsurface in southern Alberta, extending from the Canada‑United States border northward toward the central portion of the province. It is most prominently documented in well logs and outcrop sections near the Pakowki Lake region.
Economic Significance
Due to its organic‑rich shales, the Pakowki Formation is a source rock for hydrocarbon generation in the Western Canada Sedimentary Basin. It is evaluated in petroleum exploration for its potential contribution to oil and natural‑gas reservoirs within overlying and adjacent strata.
History of Investigation
The unit was first described in the mid‑20th century by geologists mapping the Cretaceous succession of southern Alberta. Its nomenclature follows standard Canadian stratigraphic naming conventions, linking the unit to a geographic feature (Pakowki Lake).
References
- Lexicon of Canadian Geologic Units, Natural Resources Canada.
- Geological Survey of Canada, publications on the Late Cretaceous stratigraphy of the Western Canada Sedimentary Basin.
Note: The above information reflects the current consensus in published geological literature. No speculative or unverified details are included.
