Midcontinent rift system

geological feature, North America

Also known as: Keweenawan rift system

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In Precambrian: Orogenic belts
…was the formation of the Midcontinent (or Keweenawan) rift system that extends southward for more than 2,000 km (about 1,240 miles) from Lake Superior.
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In North America: 1.3 billion to 950 million years ago
The Midcontinent Rift developed contemporaneously with northwest-directed crustal-scale thrusting in the Grenville orogenic belt. The belt is exposed principally along the southeastern margin of the Canadian Shield, but inliers occur in the Appalachians, the East Greenland Caledonides, Texas, and Mexico. It has been traced at depth…
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