An early Proterozoic supercontinent whose assembly is commonly placed broadly around 1.9–1.6 billion years ago. The terms Columbia and Nuna are often used interchangeably, although some reconstructions distinguish their regional or temporal meanings. Geological connections and dated apparent polar wander paths test proposed configurations.[ref]
Assembly and breakup of the core of Paleoproterozoic-Mesoproterozoic supercontinent Nuna by David A. D. Evans and Ross N. Mitchell. pp. 443–446, quantitative reconstruction of the core and its assembly–breakup sequence.
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