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Generalized geologic map of the Yosemite area. (Based on a USGS image) The exposed geology of the Yosemite area includes primarily granitic rocks with some older metamorphic rock. The first rocks were laid down in Precambrian times, when the area around Yosemite National Park was on the edge of a very young North American continent.
Yosemite Valley and the Mariposa Grove were added to the national park in 1906. The United States Army had jurisdiction over the national park from 1891 to 1914, followed by a brief period of civilian stewardship. The newly formed National Park Service took over the park's administration in 1916. Improvements to the park helped to increase ...
The National Park Service (NPS) was formed in 1916, and Yosemite was transferred to that agency's jurisdiction. Tuolumne Meadows Lodge, Tioga Pass Road , and campgrounds at Tenaya and Merced lakes were also completed in 1916. [ 66 ]
Comprising 1,200 square miles, Yosemite has a lot to offer visitors. “It’s, like, between the natural history, the culture history, the wildlife, the beauty and the size, there’s so much to ...
The valley floor owes its flatness to sediment deposited by these stands (the last glaciers in the valley were small and did not remove much old lake sediment). The last stand of Lake Yosemite was about 5.5 miles (8.9 km) long and was impounded by a terminal moraine near the base of El Capitan.
Half Dome is a quartz monzonite batholith at the eastern end of Yosemite Valley in Yosemite National Park, California. It is a well-known rock formation in the park, named for its distinct shape. One side is a sheer face while the other three sides are smooth and round, making it appear like a dome cut in half.
The El Capitan Granite is relatively free of joints, and as a result the glacial ice did not erode the rock face as much as other, more jointed, rocks nearby. [10] Nonetheless, as with most of the rock forming Yosemite's features, El Capitan's granite is under enormous internal tension brought on by the compression experienced prior to the ...
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