Answer :
The type of fault responsible for the Laramide uplift that created the Rocky Mountains in Rocky Mountain National Park is the b) reverse fault.
The Laramide Orogeny, which occurred approximately 70 to 40 million years ago, involved significant compressional forces that caused the Earth's crust to deform.
In the case of the Laramide uplift, the reverse faults involved are often referred to as thrust faults. A thrust fault is a special type of reverse fault that has a very low-angle fault plane, typically less than 45 degrees.
These faults are common in areas where large mountain ranges have been formed due to continent-continent collisions, such as the Rockies.
Complete question-
What type of fault was responsible for the Laramide uplift that created the Rocky Mountains in Rocky Mountain National Park?
a) Normal fault
b) Reverse fault
c) Strike-slip fault
d) Thrust fault
Final answer:
The Laramide uplift of the Rocky Mountains in Rocky Mountain National Park was primarily caused by compressional forces associated with the subduction of the Farallon Plate beneath the North American Plate. This tectonic event, known as the Laramide orogeny, resulted in the formation of the Rocky Mountains through the uplift and deformation of the region. The specific type of fault responsible for this uplift is a thrust fault.
Explanation:
The Laramide uplift of the Rocky Mountains in Rocky Mountain National Park was primarily caused by compressional forces associated with the subduction of the Farallon Plate beneath the North American Plate. This tectonic event, known as the Laramide orogeny, occurred approximately 70 to 40 million years ago during the Late Cretaceous to early Paleogene period.
The Laramide orogeny resulted in the uplift and deformation of the Rocky Mountains, including the area now known as Rocky Mountain National Park. The specific type of fault responsible for this uplift is a thrust fault.
A thrust fault occurs when one rock mass is pushed up and over another along a gently inclined fault plane. In the case of the Laramide uplift, the compressional forces caused rocks to be pushed together and uplifted, resulting in the formation of the Rocky Mountains.
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