The Rocky Mountains are known for their beautiful scenery. Which process of the Rocky Mountains required the longest period of time to occur?

Question

14-08-2023
Biology

College

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The Rocky Mountains are known for their beautiful scenery. Which process of the Rocky Mountains required the longest period of time to occur?

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MubeenaD MubeenaD · Answer 1 · 2024-05-05T11:22:01-04:00

The Rocky Mountains were primarily formed during the Laramide Orogeny in the Late Mesozoic to Early Cenozoic eras, with the shaping of their current landscape taking the longest time due to prolonged erosion and glaciation.

The most extensive and time-consuming processes that led to the formation of the Rocky Mountains include the initial upthrusting of the crust during mountain-building events and the subsequent long-term erosion by water and ice. The building of the Rockies primarily started with the Laramide Orogeny during the Late Mesozoic and Early Cenozoic eras, which required millions of years. The range was formed due to low-angle subduction causing deformation and was later sculpted significantly by glaciation and erosion.

The Rockies stopped growing and became inactive, but the shaping of their current landscape continued. The peaks and ridges we see today were rounded and carved out by erosional processes, particularly glaciation, over millions of years after their formation. This glaciation included major ice ages and smaller events like the Little Ice Age, which lasted from the 15th to 18th centuries and has contributed to the current retreat of glaciers due to climate change.