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Proto-North America

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Over the last billion years, many events have shaped NY and Massachusetts. Proto-North America collided with four land masses that created Grenville, Taconic, Acadian, and Alleghanian. All of these mountain ranges have been eroded and weathered, depositing sediments. Organisms have prospered and created fossils which are imprinted on our world, inland seas have come in and out, Delta has formed and become rock, and rifts have opened and closed. Billions of years have passed and all of these things have created what we now call NY and Massachusetts. Narrow strips of land were smashed together to create the beginnings of North America and the Precambrian shield. This Proto-North America had sediment eroding off of its continental margins, into …show more content…
The collision crumpled the crust, creating a tall mountain range that stretched from Canada to Mexico: the Grenville Mountains. These mountains are the earliest evidence of mountain building in our region, and the rocks remaining from that ancient mountain chain are the oldest rocks that we see exposed at the surface in the Northeast today. The heat and pressure caused by the collision created volcanic material, putting the hot molten rock into the crust, and metamorphosed the sediments that had eroded from the Precambrian shield before the collision occurred. Evidence of this is in the Grenville rocks, which are metamorphosed sedimentary rocks with igneous rock that have been folded by the collisions compression. Rodinia collided with Proto-North America 1 billion years ago. The Collision made the Grenville belt be smooshed between the two land masses and pushed up to form the Grenville mountains.This is evidenced by When Proto-North America collided with other continents it created one supercontinent called Rodinia. When the continents finally split apart, ocean water filled it in and that is how the Iapetus ocean was created. Over …show more content…
Baltica and North America had merged creating the northern Appalachians. The Iapetus Ocean narrowed as the oceanic crust was subducted under North America’s continental crust. When Africa collided with North America during the Permian, the continental crusts got crushed together to make a tall range of mountains. Sediments from the proto-Atlantic ocean basin and the continental shelf and slope of North America were forced upwards and squished along with the crust. About 400 million years ago, during the Devonian Period, plate tectonics also caused a mountain-building event known as the Acadian Orogeny. In the Acadian Orogeny, Avalonia was crushed between Baltica, modern-day Europe, and proto-North America as they collided and Avalonia accreted onto proto-North America. This crush turned some of the igneous rock that made up Avalonia into metamorphic rock, which is rock changed by high heat and high pressure. The metamorphosed rocks were later covered by sedimentary rocks. Following the breakup of Pangea, 200 million years ago, Massachusetts experienced a period of erosion, deposition, and lithification, which includes compaction and cementation. This process forms sedimentary rocks, which are rocks composed of pieces of pre-existing rocks. The Queenston formation was laid down over a period of several million years, about 451 to 446

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