"The Flatirons are rock formations near Boulder, Colorado. There are
five large, numbered Flatirons ranging from north to south (First
through Fifth, respectively) along the east slope of Green Mountain, and
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 consist of conglomerate sandstone of the Fountain
Formation. Geologists estimate the age of these rocks as 290-296 million
years. The Flatirons on Green Mountain are within the City of Boulder
Open Space and Mountain Parks system. They are popular destinations for
hikers and rock climbers, with rock grades ranging from easy (5.0) to
world-class (5.14)". [Fonte]
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