Denver/Red Rock & Garden of the Gods Park: colorful celestial spires, July 2023

Denver/Red Rock & Garden of the Gods Park: colorful celestial spires, July 2023

Getting to the top is optional. Getting down is mandatory.

Ed Viesturs

Those colorful celestial spires:

“Their story begins hundreds of millions of years ago, when the area around the Garden hosted the mighty “Ancestral Rockies” (so named because they rose in much the same place as our modern Rockies). Like all mountain ranges, they slowly wore away. Rewind 280 million years from present day, and all that was left of the once-lofty peaks were some low hills and a thick pile of sediment that would later form Red Rocks Amphitheater.

As the mountains disappeared, the climate began to dry out, and enormous sand dunes soon marched across the region, leaving behind a layer of pure, wind-blown sand whose smooth, round grains are all the same size. Many of the park’s spires, including North Gateway Rock and White Rock, are legacies of this ancient sand sea. Similar rocks, often with the steep, angular layering characteristic of sand dunes, have been found from Arizona to Montana, indicating that this desert was Saharan in scale.

After millions of years, the dunes retreated. The sands were buried beneath younger sediments and gradually compacted and cemented into the uniform sandstone locally known as the Lyons Formation, which is used across the Front Range as patio stone.

Although originally deposited in horizontal sheets, the Lyons was later deformed by the tremendous forces associated with the rise of the Rockies, which about 65 million years ago began to uplift the much older igneous and metamorphic “basement” rocks that form the Rockies’ core. In the process the Lyons Sandstone was tilted, especially near the major faults, the planar features where much of the uplift occurred. One of these faults runs right through the Garden of the Gods, and its handiwork—the amazing fins—will surely continue to inspire visitors for what, to mere mortals, will seem like eternity.”

~ Terri Cook (Cook is an award-winning freelance writer based in Boulder)


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