Lyell Glacier, Cirque glacier in Tuolumne County, US
Lyell Glacier is a cirque glacier on the slopes of Mount Lyell in Yosemite National Park, Tuolumne County, California. The glacier sits at around 13,000 feet (3,960 m), tucked into the rocky bowl just below the park's highest summit at about 13,120 feet (4,000 m).
The glacier was named in the 19th century when American explorers began mapping the Sierra Nevada and assigned scientific figures' names to major landmarks. Over the following decades, it became one of the most closely watched glaciers in the country as researchers began tracking its retreat.
The glacier's name comes from Charles Lyell, a 19th-century geologist who helped shape how people understand rock and ice formations. Naming peaks and glaciers after scientists was a common practice in the Sierra Nevada during the early years of American exploration.
Reaching the glacier requires hiking the John Muir Trail, which involves high-altitude terrain and should only be attempted by those with solid outdoor experience. Conditions can shift quickly at this elevation, so proper gear and careful planning are essential before setting out.
Lyell Glacier moves so slowly that some scientists debate whether it still qualifies as a true glacier or has become a remnant ice patch. This question has made it a reference point in discussions about how glaciers are defined and when they officially cease to exist.
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