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Granite Carved by Ice
Yosemite Valley is a glacier's signature: an ice river ground this canyon out of Sierra Nevada granite, leaving walls that drop half a mile straight down. El Capitan rises about three thousand vertical feet from the meadow floor — the largest single granite face of its kind — while Half Dome, a quartz monzonite dome topping out over eight thousand eight hundred feet, appears sliced by one impossibly clean plane. Glaciers did the slicing, not any tool. Stand in Cook's Meadow and compare El Capitan's shadow against the trees at its base.
Lincoln's Wartime Signature
In June 1864, in the middle of the Civil War, Abraham Lincoln signed the Yosemite Grant, giving the valley and the Mariposa sequoia grove to California to keep open for public enjoyment — the first land any government set aside purely for that reason. But the grant covered only the valley floor, and homesteaders fenced meadows and charged tolls at its gates inside it. The wider park arrived on October 1, 1890, after a campaign led by Robert Underwood Johnson and John Muir. Read the Yosemite Grant plaque beside the visitor center wall.
Muir's Long Argument
John Muir herded sheep through these meadows in 1869, slept in Yosemite Falls' spray, and spent the rest of his life proving the valley was carved by ice rather than catastrophe — a theory geologists resisted for years. His magazine essays turned the High Sierra into a national cause, and his lobbying delivered the 1890 park. The valley itself only merged into the park in 1906, ending the fence-and-toll era. Ride or hike up to Glacier Point and trace the valley's U-shape with your finger.