Intrusive Suite of Sonora Pass

The Intrusive Suite of Sonora Pass (also, the Sonora Pass Intrusive Suite) is one of several intrusive suites in Yosemite National Park. These also include


 * 1) Fine Gold Intrusive Suite
 * 2) Intrusive Suite of Buena Vista Crest
 * 3) Intrusive Suite of Jack Main Canyon
 * 4) Intrusive Suite of Merced Peak
 * 5) Intrusive Suite of Yosemite Valley
 * 6) Tuolumne Intrusive Suite

The Intrusive Suite of Sonora Pass is ~92-89 Ma, and is the northernmost of four large Late Cretaceous zoned intrusive suites in the central Sierra Nevada batholith.

Rock types
On a large scale, it is composed of Kinney Lakes granodiorite and the younger Topaz Lake granodiorite.

On a finer scale, the Intrusive Suite of Sonora Pass is made of light-gray, coarse-grained biotite granodiorite, plus granite with roughly equant, well-formed potassium feldspar phenocrysts composing about 2–10% of the rock. Quartz usually occurs in clots of 0.5 cm. The mafic mineral content is about 10%.