Nena, an acronym for Northern Europe–North America, is the Early Proterozoic amalgamation of Baltica and Laurentia into a single "cratonic landmass", a name first proposed in 1990. Since then several similar Proterozoic supercontinents have been proposed, including Nuna and Arctica, that include other Archaean cratons, such as Siberia and East Antarctica.
In the original concept Nena formed c. Penkean, Makkovikan, Ketilidian, and Svecofennian orogenies. However, because Nena excludes several known Archaean cratons, including those in India and Australia, it is strictly speaking not a supercontinent. Nena, or Nuna, can, nevertheless be though of as the core of Columbia, another supercontinent concept with several proposed configurations.in the
Nena as a continent has been associated with the Sudbury Basin Impact.
- Gower, C. F.; Ryan, A. B.; Rivers, T. (1990). "Mid-Proterozoic Laurentia–Baltica: an overview of its geological evolution and a summary of the contributions made by this volume". In Gower, C. F.; Rivers, T.; Ryan, B. Mid-Proterozoic Laurentia-Baltica (PDF). St. John's Newfoundland: Geological Association of Canada. pp. 1–20. Retrieved 1 April 2018.
- Meert, J. G. (2012). "What's in a name? The Columbia (Paleopangaea/Nuna) supercontinent" (PDF). Gondwana Research. 21 (4): 987–993. Retrieved 1 April 2018.
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