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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.
Pangaea's supercontinent cycle is a good example of the efficiency of using the presence or lack of these entities to record the development, tenure, and break-up of supercontinents. There is a sharp decrease in passive margins between 500 and 350 Ma during the timing of Pangaea's assembly.
Both private stations began functioning as TV networks on 10 July 1998. The recession of the Colombian economy during the late 1990s weakened the state-run networks and the programadoras . But the companies that produced the networks' shows also had to face a new landscape of Colombian television, as Caracol and RCN now dominated.
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[133]: 370 [134] Rodinia may have been preceded by Early-Middle Proterozoic continents called Nuna and Columbia. [133]: 374 [135] [136] After the break-up of Rodinia about 800 Ma, the continents may have formed another short-lived supercontinent around 550 Ma. The hypothetical supercontinent is sometimes referred to as Pannotia or Vendia.
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