The immense weight of the ice had also caused the peripheral regions to sink. Ongoing Processes: A Dynamic System.
Step-by-Step: From Tectonic Rifts to Isostatic Rebound
Geographic Isolation and Modern Characteristics The Role of the Canadian Shield The Canadian Shield acts as a geologic container for the bay. When the climate warmed and the ice retreated roughly 12,000 years ago, the massive weight was removed.
During the Pleistocene epoch, this continental glacier, sometimes over two miles thick, advanced and retreated multiple times across the landscape. The story of how the Hudson Bay formed begins deep within the violent tectonic forces that shaped the North American continent.
Step-by-Step Formation Process of Hudson Bay
However, unlike the rift valleys that would become oceans, this particular rift failed to separate the continent into distinct landmasses. The land, no longer suppressed, began a slow process of isostatic rebound, rising back upward and further defining the basin's shape.
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