From Infogalactic: the planetary knowledge core
Nena formed about 1.8 billion years ago but became part of the global supercontinent Columbia around 1.1 billions of years ago.
Nena as a continent has been associated with the Sudbury Basin Impact.
- Campbell, Ian H., Charlotte M. Allen. "Formation of Supercontinents Linked to Increases in Atmospheric Oxygen." Nature. 1 (2008): 554–558.
- Sankaran, A. V., The Supercontinent Medley: Recent Views. Current Science, 25 August 2003.
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