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Kenoran orogeny
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Kenoran orogeny

geology
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Article History

Kenoran orogeny, a Precambrian thermal event on the Canadian Shield that occurred 2.5 billion years ago (± 150 million years). Rocks affected by the Kenoran event represent some of the oldest rocks in North America and occur in the Superior Province surrounding Hudson Bay on the south and east, the Slave Province in northwestern Canada, and the small Eastern Nain Province on the northeastern Labrador coast.

Beyond the shield area, rocks equivalent in age to Kenoran rocks occur in Wyoming and the Black Hills. Parts of the Lewisian Gneiss of Scotland have been dated at 2.4 billion to 2.6 billion years ago, and these have been correlated with the Kenoran thermal event.