Harney Peak Granite (late Paleoproterozoic, 1.695 to 1.715 Ga; Mt. Rushmore, Black Hills, South Dakota, USA)

I have mixed feelings about the Mount Rushmore locality in the Black Hills of South Dakota. It's an historic site and memorializes four of the greatest people in the history of the planet (George Washington, Thomas Jefferson, Theodore Roosevelt, Abraham Lincoln), but it's also just large-scale defacement of nature. I'd rather have the natural mountainside. Destroying mountainsides in the Black Hills is a fad that is spreading. American Indians are defacing another Black Hills mountain nearby - the Crazy Horse Memorial (www.unitednativeamerica.com/tribal/crazyhorse.jpg). I wish people would leave nature alone.

Anyway - the rocks at and around the carved faces are part of the Harney Peak Granite (late Paleoproterozoic, 1.695 to 1.715 billion years). The dark-colored, subhorizontal streak of rocks below Washington's chest is the host rock for the Harney Peak Granite. The granite intruded through metamorphic rocks, principally quartz-mica schists. Metamorphism of the schist host rocks occurred not long before intrusion of the granite. The schists date to 1.715 to 1.750 billion years. Both rock types (granite and schist) can be closely examined along the walkway between the public parking area and Mount Rushmore itself.

Locality: Mount Rushmore, Black Hills, southwest of the town of Keystone, western South Dakota, USA

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Taken on: November 28, 2014

Tags:

Harney

Peak

Paleoproterozoic

Proterozoic

Precambrian

Mt.

Mount

Rushmore

Black

Hills

South

Dakota

geology « less

Sets appears in: • South Dakota Rocks & Fossils • Harney Peak Granite (Paleoproterozoic, ~1.7 Ga; Black Hills, South Dakota, USA) more » • Black Hills geology (western South Dakota, USA) • JSJ in the Field « less

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