The combination of rising sea levels from the meltwater and the sinking peripheral lands allowed the Atlantic Ocean to flow into the rift basin. The Tectonic Rifting: Hudson Bay as a Failed Rift Plate Divergence and Crustal Thinning Approximately 750 million years ago, during the Neoproterozoic era, the supercontinent Rodinia began to break apart.
Understanding Hudson Bay Land Rebound After the Ice Age
The Sculpting Force: The Laurentide Ice Sheet Erosion and Rebound The most dramatic and direct agent in shaping the modern Hudson Bay was the Laurentide Ice Sheet. However, unlike the rift valleys that would become oceans, this particular rift failed to separate the continent into distinct landmasses.
This created the initial, brackish waters of Hudson Bay, which were later influenced by freshwater input from the numerous rivers draining into it. This process of continental rifting pulled the ancient cratons apart, creating a massive geological depression.
Land Rebound After the Ice Age: Explaining Hudson Bay's Ongoing Shaping
The immense weight of the ice had also caused the peripheral regions to sink. As it moved, the immense weight of the ice acted like a bulldozer, scraping and gouging the softer rock of the rift basin, deepening and widening it.
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