The land, no longer suppressed, began a slow process of isostatic rebound, rising back upward and further defining the basin's shape. When the climate warmed and the ice retreated roughly 12,000 years ago, the massive weight was removed.
Geological Events Timeline: From Ancient Cratons to Modern Marginal Sea
The Ancient Foundations: Craton and Orogeny Long before the first glacier crawled across the land, the stable, ancient core of North America provided the stage. This, combined with the massive freshwater input from rivers like the Churchill and Nelson, creates one of the world's largest and most significant marginal seas, with its own distinct ecosystem and hydrology.
This created the initial, brackish waters of Hudson Bay, which were later influenced by freshwater input from the numerous rivers draining into it. Ongoing Processes: A Dynamic System.
Geological Events Timeline: From Ancient Craton to Modern Marginal Sea
Its connection to the open ocean is restricted, primarily through the narrow Hudson Strait, which allows for a slow exchange of water. This immense body of water, often mistaken for a simple extension of the Atlantic Ocean, is actually a distinct marginal sea with a geological origin tied to the very birth of the planet.
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