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. This process of continental rifting pulled the ancient cratons apart, creating a massive geological depression.
Ongoing Land Rebound and Hudson Bay Formation Today
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. This geographic isolation is a key factor in the Hudson Bay's unique character.
The combination of rising sea levels from the meltwater and the sinking peripheral lands allowed the Atlantic Ocean to flow into the rift basin. This created the initial, brackish waters of Hudson Bay, which were later influenced by freshwater input from the numerous rivers draining into it.
Ongoing Land Rebound Impact on Hudson Bay Formation Today
This ancient, cold, and rigid rock was fundamentally different from the younger, more pliable sediments surrounding it, making it resistant to the forces that would later reshape the continent. However, unlike the rift valleys that would become oceans, this particular rift failed to separate the continent into distinct landmasses.
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