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The Grenville mountains
The Grenville province is a belt of deeply altered rock running from Labrador to Texas, the remains of a mountain range pushed up around a billion years ago. The Grenville province runs from Labrador to Texas and shows wherever younger layers have been stripped away. The rocks are metamorphic and formed at twenty to thirty kilometres depth — what you see in the Adirondacks is not the mountain but its underside. That Rodinia existed at all was only established in the 1990s, largely by correlating Grenville rocks with equivalent belts in Scandinavia and Amazonia.
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