Trans-Hudsonian orogeny

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The Trans-Hudsonian orogeny was a major orogenic event in North America during the Proterozoic. The orogeny resulted from the collision of the Superior craton of eastern Canada with the Hearne craton in northern Saskatchewan and the Wyoming craton of the western United States. The orogenic belt extends from Hudson Bay west through Saskatchewan and then south through the western portions of the Dakotas and Nebraska. The event occurred at 1.9 - 1.8 billion years ago and resulted in extensive folding and thrust faulting along with metamorphism and granitic intrusion. The core of the Black Hills of South Dakota represents an exposed portion of this orogenic belt.

[edit] References

• Trans-Hudsonian Suture--Collision of Superior with Hearne/Wyoming Province
• John B. Brady, et al, eds. (2004) Precambrian Geology of the Tobacco Root Mountains, Montana (Special Papers (Geological Society of America), 377.) ISBN 0-8137-2377-9