Flatirons, Boulder, Colorado, USA
The Flatirons are incredible rock formations in near Boulder, Colorado, consisting of flatirons. There are five large, numbered Flatirons ranging from north to south along the east slope of Green Mountain.
The term “The Flatirons” sometimes refers to these five alone. Numerous additional named Flatirons are on the southern part of Green Mountain, Bear Peak, and among the surrounding foothills.
The Flatirons were known as the “Chautauqua Slabs” c. 1900 and “The Crags” c. 1906. There are two hypotheses regarding the origin of the current name, one based on resemblance to old-fashioned clothes irons, the other based on resemblance to the Flatiron Building completed in 1902.
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