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The Laramide orogeny was a period of mountain building in western North America, which started in the Late Cretaceous, 70 to 80 million years ago, and ended 35 to 55 million years ago. The exact duration and ages of beginning and end of the orogeny are in dispute.welve kilometers of structural relief between basins and adjacent uplifts is not uncommon. The basins contain several thousand meters of Paleozoic and Mesozoic sedimentary rocks that predate the Laramide orogeny. As much as 5000 m of Cretaceous and Cenozoic sediments filled these orogenically defined basins.
Mountain topography in convergent orogens is the result of the balance between tectonic uplift, subcidence by deposition of sediments and mountain erosion. Image Credit: MBG. Weathering and erosion are two important geologic processes in the rock cycle that play a major role in modifying the geologic expression of orogenic processes. The high relief originated when mountains are built, creates disequilibrium within the Earthâs crust.