Great Falls orogeny
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The Great Falls orogeny, or the Big Sky orogeny (in reference to its last phase found in the Tobacco Root Mountains), was a
Wyoming craton began to migrate closer together with the closure of the Medicine Hat Ocean
.
In the main phase of the Great Falls orogeny, arc magmatism and anatexis occurred as the Montana metasedimentary terrane was buried beneath the Hearne craton (sometimes called the Medicine Hat-Hearne crust). The Big Sky orogeny refers to the last phase of the orogeny when the metasedimentary terrane was deformed, metamorphosed, melted and preserved in the Tobacco Root Mountains. [1]
See also
References
- ISBN 9780813725222.)
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