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. The combination of rising sea levels from the meltwater and the sinking peripheral lands allowed the Atlantic Ocean to flow into the rift basin.
Hudson Bay Formation Ice Age Impact Investigation
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. 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.
The land, no longer suppressed, began a slow process of isostatic rebound, rising back upward and further defining the basin's shape. 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.
Hudson Bay Formation Ice Age Impact Investigation
The Canadian Shield, a vast bedrock foundation billions of years old, forms the heart of this region. Simultaneously, the land itself was rising, but not uniformly.
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