Nagssugtoqidian orogeny A late Archaean and Proterozoic phase of mountain building affecting a belt 240–300 km wide in what is now western Greenland. It comprised two major episodes, the first about 2600 Ma ago, the second about 1900–1500 Ma ago, making it approximately contemporaneous with the Hudsonian, Laxfordian, and Svecofennian orogenies.
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