Chautauqua Park: Royal Arch Trail, Photo Gallery, Boulder - Denver - Golden - Fort Collins - Lyons, Colorado

Chautauqua Park: Royal Arch Trail

Boulder - Denver - Golden - Fort Collins - Lyons

Royal Arch (6,915') is perched high along a rugged fold in the Boulder Flatirons. These rocks are remnants of the Fountain Formation, a mineral-rich sand eroded from the ancestral Rocky Mountain uplift 300 M years ago. Sediments deposited by the ebb and flow of inland oceans compressed this layer into sandstone, thrust upward 45 M years ago by the same tectonic forces that created our modern Rocky Mountains. Royal Arch is a fragment of the exposed Fountain Formation sculpted by water, wind and mechanical erosion into the 20’ span we see today.

Related Trails: Royal Arch

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