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The story of Yosemite's landscape began about 500 million years
ago when the Sierra Nevada region lay beneath an ancient sea.
Thick layers of seabed sediments eventually were folded and twisted
and thrust above sea level. Simultaneously molten rock welled
up from deep within the Earth and cooled slowly beneath the sediment
layers to form granite. Erosion wore away nearly all of the overlying
rock, exposing the granite. Even as uplifts still were forming
the Sierra, water and then glaciers worked at carving Yosemite's
face. [Continue]
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