Random Earth's Known SuperContinents (9 items)

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  (#7) Pangea

  Formed 300 Million Years Ago

  This is the one that everyone has heard of, and because it's the only one we were taught about in school, is thought of as Earth's only supercontinent. During the Early Permian, the northwestern coastline of Gondwana smashed into the Euramerican continent. With the fusion of the Angaran part of Siberia to this combined landmass, the assembly of Pangea was pretty much done becoming 'super'.

  It began to break apart about 200 million years ago, during the Early Jurassic, eventually forming the modern continents and the Atlantic and Indian Oceans.
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  (#3) Kenorland

  Formed: 2.7 Billion Years Ago

  Kenorland is basically thought to have been made up from multiple smaller cratons (Zimbabwe, Kaapvaal, Gawler, Pilbara, and Yilgarn) , cratons being stable portions of continental crust from unstable geologic regions. Picture them as both shields - in which the basement rock crops out at the surface- and platforms - in which the basement is overlain by sediment.

  At this point in Earth's history, it was pretty much all volcanic/igneous activity all the time, until those cratons started to collide. When Kenorland started to break up, the oceans were just beginning to oxygenate and this is the point when the "snowball earth" theory takes place.
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  (#4) Columbia

  Formed 1.8 Billion Years Ago

  The formation of Columbia (also known as Nuna and Hudsonland) was the result of global scale collision events. It consisted of the proto-cratons that had previously made up Laurentia, Baltica, the Ukranian and Amazonian Shields, Australia and possibly Siberia, North China and Kalaharia.

  When it began to break up, it is thought that its pieces began moving around independently for several hundred million years and then, about a billion years ago, the band got back together and formed our next super: Rodinia.
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  (#6) Pannotia

  Formed 600 Million Years Ago

  Also known as the Vendian supercontinent, Pannotia lasted up to the end of the Precambrian period, about 550 Million years ago. It would eventually split into pieces - Laurentia, Siberia and Baltica with the main landmass of Gondwana to the south.

  This is when you can really start to see the shapes of today's continents starting to become recognizable.
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  (#2) Ur

  Formed: 3 Billion Years Ago

  Ur is the first definitively known continent, despite being smaller at the time than Australia is now. Because it was the only one at the time, and because Vaalbara is still a theory, Ur is considered to be the first "super"continent. Ur would eventually join up with the continents Nena and Atlantica about one billion years later to form the supercontinent Rodinia. Ur actually survived for quite a while, making it through the breakup of Rondina and into the era of Pangaea, until it broke apart about 208 million years ago into Laurasia and Gondwanaland.

  You can now find the remains of Ur in parts of Africa, Australia, India, and Madagascar.
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  (#8) Laurasia & Gondwanaland

  Formed 200 Million Years Ago

  These two guys aren't really a single supercontinent, they are the result of Pangea breaking in half and creating two enormous continents, Gondwannaland and Laurasia.

  Gondwanaland contained most of the landmasses in today's Southern Hemisphere, including Antarctica, South America, Africa, Madagascar and Australia, as well as the Arabian Peninsula and the Indian subcontinent, which have now moved entirely into the Northern Hemisphere.

  Laurasia, to the north, contained North America, Europe, and Asia (but not India). Laurasia is thought to have fragmented into the present continents of North America, Europe, and Asia some 66 million to 30 million years ago.

  The fracturing of both these supercontinents give us the picture of the globe we have today.

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