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Avalonian orogeny


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An episode of mountain building, named after the Avalon Peninsula of Newfoundland, that occurred about 650–500 Ma ago (Cambrian to Ordovician) as a result of rifting (see rift) and volcanicity associated with the opening of the Atlantic. Its rocks are found intermittently from Georgia to Newfoundland. See appalachian orogenic belt.

Subjects: Earth Sciences and Geography.


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