Tuolomne Meadows in Yosemite Park was at the center of a 2,000-foot thick icefield. At Pothole Dome, you see ice-related features carved in granitic rock. Farther east on Tioga Pass Road you see the oldest rocks of the park and descend the steep eastern slope of the Sierra.

Tuolomne Meadows was at the center of the 2,000-foot thick icefield of the same name. View from Pothole Dome.	Large feldspar crystals on Pothole Dome, typical of the Cathedral Peak Granodiorite, which were polished by the glacier more than the surrounding rock.
The finer grained aplite dike rock on Pothole Dome stood up and was polished by the glacier more than less resistant coarser grained granite.	One of the potholes of Pothole Dome, carved out by rocks in a whirlpool that occupied a shaft within the glacial ice.
Mt. Dana is underlain by red Mesozoic volcanic rocks of a roof pendant, in contrast to the granitic rock at the right. Its relatively flat west end is a probable uplifted remnant of the plain that lay at this location before about 15 million years ago.	Red Mesozoic volcanic rocks in small roof pendant within light colored granite, along the descent of the steep eastern slope of the Sierra, east of Tioga Pass.