Boulder’s Flatirons, Colorado

Rising more than 2,000 feet above the plains, the Flatirons rock formation is the iconic backdrop of Boulder, Colo. These iron-rich sandstone formations were tilted on-end 300 million years ago when continents collided and the ancestral Rockies were uplifted. At 5,430 feet of elevation and 28 miles from Denver, Boulder is where the Great Plains meet the foothills of the Rockies.

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