Laurentia

From Academic Kids

Laurentia is the craton at the heart of North America. Many times in its past, Laurentia has been a separate continent as it is now in the form of North America. During other times in its past, Laurentia has been part of a supercontinent. It is named after the Laurentian Shield.

This is an outline of the history of Laurentia over about three billion years:

Partial (incomplete) history of Laurentia in chronological order

  • ~2.5 billion years ago, Arctica formed as an independent continent.
  • ~2.45 billion years ago, Arctica was part of the major supercontinent Kenorland.
  • ~2.1 billion years ago, when Kenorland shattered, the Arctican craton was part of the minor supercontinent Nena along with Baltica and Eastern Antarctica.
  • ~1.8 billion years ago, Laurentia was part of the major supercontinent Columbia.
  • ~1.5 billion years ago, Laurentia was an independent continent.
  • ~1.1 billion years ago, Laurentia was part of the major supercontinent Rodinia.
  • ~750 million years ago, Laurentia was part of the minor supercontinent Protolaurasia. Laurentia nearly rifted apart.
  • ~600 million years ago, Laurentia was part of the major supercontinent Pannotia.
  • ~Cambrian, Laurentia was an independent continent.
  • ~Devonian, Laurentia collided against Baltica, forming the minor supercontinent Euramerica.
  • ~Permian, all major continents collide against each other for forming the major supercontinent Pangaea.
  • ~Jurassic, Pangaea rifted into two minor supercontinents: Laurasia and Gondwana. Laurentia was part of the minor supercontinent Laurasia.
  • ~Cretaceous, Laurentia was an independent continent called North America.
  • ~Neogene, Laurentia, in the form of North America, crashed into South America, forming the minor supercontinent America.
  • ~250 million years from now, all continents will crash together for forming the major supercontinent Pangaea Ultima. Laurentia will be of Pangaea Ultima.
  • ~400 million years from now, Pangaea Ultima will disintegrate, and no one knows what will happen to Laurentia when it does.

External links

Images

  • Map of Laurentia (http://www.jamestown-ri.info/gondwana_500ma.gif) - A map of Laurentia


Template:Geol-stubnl:LaurentiŽ vi:Laurentia

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