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Little is known about the paleogeography before the formation of Rodinia. Paleomagnetic and geologic data are only definite enough to form reconstructions from the breakup of Rodinia [17] onwards. Rodinia is considered to have formed between 1.3 and 1.23 Ga and broke up again before 750 Ma. [18] Rodinia was surrounded by the superocean Mirovia.
Named global superoceans include Mirovia, which surrounded the supercontinent Rodinia, and Panthalassa, which surrounded the supercontinent Pangaea. Pannotia and Columbia , along with landmasses before Columbia (such as Ur and Kenorland ), were also surrounded by superoceans.
Mirovia or Mirovoi (from Russian мировой, mirovoy, meaning "global") was a hypothesized superocean which may have been a global ocean surrounding the supercontinent Rodinia in the Neoproterozoic Era, about 1 billion to 750 million years ago. [1]
The supercontinent of Columbia broke up between 1500 and 1350 million years ago, [5] and the fragments reassembled into the supercontinent of Rodinia around 1100 to 900 million years ago, on the time boundary between the Mesoproterozoic and the subsequent Neoproterozoic. [7]
The Pan-African Ocean is a hypothesized paleo-ocean whose closure created the supercontinent of Pannotia. [1] The ocean may have existed before the break-up of the supercontinent of Rodinia.
Rodinia lasted for 250 mya and then began to come apart between 850 and 800 mya. The continent began to break part at a single point but then fractured and ripped open in three different directions. Two of the three rifts that were created were successful and the third failed.
When the break-up of Rodinia was complete c. 0.6 Ga Baltica became an isolated continent — a 200 million year period when Baltica was truly a separate continent. [12] Laurentia and Baltica formed a single continent until 1.265 Ga which broke up some time before 0.99 Ga.
About 2.5 billion years ago (in the Siderian Period), Siberia was part of a continent called Arctica, along with the Canadian Shield.Around 1.1 billion years ago (in the Stenian Period), Siberia became part of the supercontinent of Rodinia, a state of affairs which lasted until the Tonian about 750 million years ago when it broke up, and Siberia became part of the landmass of Protolaurasia.