Uplift and erosion

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Uplift and erosion Empty Uplift and erosion

Post  akaishuu on Sat Oct 02, 2010 7:08 pm

Starting 10 million years ago, vertical movement along the Sierra fault started to uplift the Sierra Nevada. Subsequent tilting of the Sierra block and the resulting accelerated uplift of the Sierra Nevada increased the gradient of western-flowing streams.[43] The streams consequently ran faster and thus cut their valleys more quickly. Additional uplift occurred when major faults developed to the east, especially the creation of Owens Valley from Basin and Range-associated extensional forces. Uplift of the Sierra accelerated again about two million years ago during the Pleistocene.


Exfoliation joints have modified the near-surface portions of massive granitic rocks in the park, helping create the many spectacular domes, including Half Dome shown here.
The uplifting and increased erosion exposed granitic rocks in the area to surface pressures, resulting in exfoliation (responsible for the rounded shape of the many domes in the park) and mass wasting following the numerous fracture joint planes (cracks; especially vertical ones) in the now solidified plutons

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Uplift and erosion Empty Re: Uplift and erosion

Post  heroisthai on Wed Nov 24, 2010 9:04 pm

The uplifting and increased erosion exposed granitic rocks in the area to surface pressures, resulting in exfoliation (responsible for the rounded shape of the many domes in the park) and mass wasting following the numerous fracture joint planes (cracks; especially vertical ones) in the now solidified plutons
Thank you very much




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