Saturday, October 1, 2011

Yosemite National Park

On October 1, 1890, an act of Congress creates Yosemite National Park.

Yosemite National Park, California - Half-Dome is the classic and jaw-dropping example of an exfoliation dome. Located in perhaps the world's best example of a glacially carved canyon, Half-Dome's rounded appearance is due to sheet jointing (or exfoliation). The granitic pluton that formed the Sierra Nevada was slowly eroded, releasing pressure and causing the expansion of the underlying rock. Joints formed parallel to the earth's surface, which have since been exhumed and exposed. The sheer vertical face of Half-Dome, parallels regional joints and was carved out by glaciers.

Releases: All photographs and images in this archive (NPS) are "public domain" images. You are free to use these images without a release from the National Park Service. However, the photographs and images must not be used to imply National Park Service endorsement of a product, service, organization or individual.

This image or file is a work of an employee of the United States Federal Government, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image or file is in the public domain.

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Photo Credits: Credit photographs to the National Park Service.

Yosemite National Park

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