Britannica Concise Encyclopedia:

Andean Geosyncline


Linear trough in the Earth's crust in which rocks were deposited in South America in the Mesozoic Era (248 – 65 million years ago) and Cenozoic Era (65 million years ago to the present). A complex history of volcanism, uplift, block faulting, and erosion led eventually to the present configuration of the Andes Mountains.

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