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Alpine—Himalayan orogeny

Alpine—Himalayan orogeny Period of mountain building that affected both northern and southern margins of the ancient Tethyan ocean. It began in the Triassic, but reached its high point during the Late Oligocene and Miocene. The Alps are an obvious testament to this orogeny, while the gentle folds of northern France, and the Weald and London Basin in England, reflect its outer effects.

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