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Are the Boulder Flatirons Remnants of Ancient Beaches?

You will learn how Boulder’s iconic Flatirons formed. Turns out, Boulder was once beachfront property. The Flatirons are Boulder’s favorite portion of the Fountain Formation, a geological formation of mostly red sandstone. This sandstone, more appropriately called “arkose” gets its color from the pinkish feldspar contained it it. This red rock makes up the Red […]

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