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Located in Hot Springs, South Dakota, the Mammoth Site is the site of 27000 year old sinkhole and hot springs. Mammoths (mostly Columbian, but a couple of Woolly Mammoths too) occasionally wandered into the sinkhole and became stuck in the mud and unable to escape. As a consequence many mammoth skeletons were preserv...
Carved from the Precambrian Harney Peak Granite by Gutzon Borglum and a host of stonemasons, the Mount Rushmore memorial portrays the likenesses of Presidents George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln.
A view of the erosional features of the White River Badlands in eastern Badlands National Park, near Interior, South Dakota. There's a remarkably high contrast between the shadows and the sunlight, but I did my best with the exposure.
The open pit at the top of the Homestake Gold Mine in Lead, South Dakota beautifully exposes a series of Tertiary rhyolite dikes that were the focus of the hydrothermal system that formed this rich gold deposit. The open pit is no longer active, but it is a great opportunity for geologists to get a glimpse into the up...