Hiking to Dana Plateau
Bennettville (historical), United States
a year ago
We started this short but steep adventure at the trailhead at the west end of Tioga Lake on Tioga Road, just east of the Tioga Pass entrance to Yosemite National Park. We followed the signs toward Glacier Canyon and into the Ansel Adams Wilderness. This hike is a fantastic one to really see how the glaciers shaped the land. In Glazner and Stock’s book, Geology Underfoot In Yosemite National Park, they discuss the most recent glaciation that occurred between 26,000 and 18,000 years ago known as the Tioga glaciation. These glaciers deposited a whole bunch of rocks and debris, also carving out the majority of glacial features that we see today. A huge ice field formed over and around the Tuolumne Meadows, up to 2,000 feet thick in places. These glaciers smoothed the landscape under the ice, forming the domes and slabs in the Tuolumne Meadows area. A few peaks and ridges poked up above this sea of ice and they were called “nunataks.” They were a kind of bedrock island and some examples include Cathedral Peak and Unicorn Peak. Dana Plateau became a nunatak for short periods as the Tioga glaciers formed around them. These nunataks were sanctuaries for many plants and animals. It was an area that was free of ice where they could live and as the glaciers retreated, these species expanded outward from their nunataks to colonize the freshly deglaciated landscape.