The influence of paleogeography in epicontinental seas: A case study based on Middle Devonian strata from the MacKenzie Basin, Northwest Territories, Canada

摘要: Abstract The history of Middle Devonian sea level changes are recorded in the Chinchaga Formation, Lonely Bay Horn Plateau and River Formations that originated MacKenzie Basin, which is located southern Northwest Territories, Canada. These strata record an almost consistent sea-level rise throughout with punctuated deepenings. Deposition began Basin Eifelian restricted shallow water evaporites dolomites Formation. Overlying Formation open-marine carbonates belonging to were overlain by buildups. Pelagic shales Late Givetian/Early Frasnian later covered these During Early many continental basins North America had limited interactions open ocean waters. shallow-water vulnerable effects clastic shedding evaporitic drawdown commonly caused local lowstands. Several basins, including have been used construct curves. Comparison formed well-established curves shows Late-Givetian regression interpreted from some those successions not evident succession found Basin. This probably reflects fact Mackenzie was directly linked influenced affected enclosed basins.