Most of the mountains in the park are made of granite:

Granite Domes:

Half Dome:

Glacier Point:

A granite dome up close:

Nevada Falls:

Tenaya Lake from Clouds Rest:

Tuolumne Meadows:

Tuolumne Meadows from Lembert Dome:

Near Tioga Pass, however, there are two mountains of metamorphic rock: Mt. Dana and Mt. Gibbs, two of the highest peaks in the region.

Mt. Dana and Mt. Gibbs from Lembert Dome:

Map of the area near Tioga Pass, Mono Pass, and Mono Lake:

On the Mono Pass Trail:

Mono Pass:

View of Mono Lake from Mono Pass:

Close-up of the metamorphic rock, on Gaylor Peak:

In Mono Lake, limestone deposits (calcium carbonate) called Tufa are exposed because of the receding waters. The deposits form when water from springs, rich in calcium ions, enters the carbonate-rich water of the lake.

Tufa at Mono Lake: