Page "Supercontinent" Paragraph 3
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Most commonly, paleogeographers employ the term supercontinent to refer to a single landmass consisting of all the modern continents.
The earliest known supercontinent was Vaalbara.
It formed from proto-continents and was a supercontinent by 3. 1 billion years ago ( 3. 1 Ga ).
Vaalbara broke up ~ 2. 8 Ga ago.
The supercontinent Kenorland was formed ~ 2. 7 Ga ago and then broke sometime after 2. 5 Ga into the proto-continent Cratons called Laurentia, Baltica, Australia, and Kalahari.
The supercontinent Columbia or Nuna formed during a period of 2. 0 – 1. 8 billion years and broke up about 1. 5 – 1. 3 billion years ago.
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