Johnson Granite Porphyry

Johnson Granite Porphyry
Stratigraphic range: 85.4 Ma
TypeGeological formation
Area1,100 square kilometres (420 sq mi)
Location
LocationYosemite National Park
CountryUnited States of America
Type section
Named forJohnson Peak
LocationYosemite National Park

Johnson Granite Porphyry is found in Tuolumne Meadows, Yosemite National Park.

Johnson Granite Porphyry was named for Johnson Peak, the highest mountain in Tuolumne Meadows, Yosemite National Park.

Its area is estimated at 1,100 square kilometres (420 sq mi), the exposed area covering roughly 40 square kilometres (15 sq mi). Johnson Granite Porphyry is part of the Tuolumne Batholith. Its boundaries are difficult to trace, and are irregular. It is both the youngest, and the most siliceous rock of Tuolumne Intrusive Suite.

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