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The third
Flatiron bore a "CU," for the University of Colorado, in 50-foot (15 m) white letters from the 1950s until 1980, when the city painted over the initials to restore the natural look of the stone formation. CU students Dale Johnson and Robert Rowlands climbed the flatiron one night in
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The
Flatirons on Green Mountain and Bear Peak 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 (5.14b). Of note is the East Face Standard route on the Third
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November 1949 to paint the original "C." The "C" was removed and painted again, with a "U" being added in the 1950s. The letters are still faintly visible under the reddish paint used by the city in 1980.
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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
136:(elev. 8,148 ft or 2,484 m), and the term "The Flatirons" sometimes refers to these five alone. Numerous additional named Flatirons are on the southern part of Green Mountain,
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175:. Geologists estimate the age of these rocks as 290 to 296 million years; they were lifted and tilted into their present orientation between 80 and 35 million years ago, during the
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in their names. In addition, Boulder often is referred to in the tech industry as the "Silicon
Flatirons", analogous to Santa Clara Valley's famous nickname.
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179:. The Flatirons were subsequently exposed by erosion. Other manifestations of the Fountain Formation can be found in many places along the
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232:, and many businesses make use of this symbol in their logos, advertisements, and marketing materials. Many businesses also use the word
132:. There are five large, numbered Flatirons ranging from north to south (First through Fifth, respectively) along the east slope of
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Flatiron; guidebook author and longtime climber
Richard Rossiter calls it "The best 5.4 in the solar system."
228:. The area abounds with Flatirons photographs, drawings, paintings, and sculptures. The city government, the
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Images of the numbered
Flatirons on Green Mountain are ubiquitous symbols of the city of
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367:"60 years ago, Boulder's Third Flatiron got its first 'C'"
418:"Geology of Boulder Flatirons: The Fountain Formation"
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Morning view of
Flatirons from Broomfield, Colorado
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42:View of the first through fifth Flatirons from
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342:"Rock Climb East Face (Standard), Flatirons"
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16:Rock formations near Boulder, Colorado
462:Landforms of Boulder County, Colorado
411:360 Degree Panoramas Near Flat Irons
396:Climbing according to summitPost.org
310:"History of Boulder Mountain Parks"
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164:The Flatirons consist of
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21:Flatiron (disambiguation)
289:Third Flatiron, Boulder
261:View of Flatirons from
308:Mary Reilly-McNellan.
230:University of Colorado
201:Red Rocks Amphitheatre
452:Landmarks in Colorado
322:on September 23, 2020
193:Roxborough State Park
371:Boulder Daily Camera
263:Fairview High School
181:Colorado Front Range
19:For other uses, see
424:. Gibson Consulting
373:. December 26, 2009
265:in southern Boulder
220:A symbol of Boulder
156:completed in 1902.
79:39.988°N 105.2933°W
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447:Fountain Formation
185:Garden of the Gods
173:Fountain Formation
51:Highest point
154:Flatiron Building
126:Boulder, Colorado
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84:39.988; -105.2933
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426:. Retrieved
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317:the original
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377:October 28,
351:October 28,
103:Boulder, CO
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70:105°17′36″W
57:Coordinates
441:Categories
428:October 7,
326:October 2,
295:References
67:39°59′17″N
234:Flatirons
169:sandstone
144:Etymology
138:Bear Peak
130:flatirons
111:Flatirons
95:Geography
238:Flatiron
211:Climbing
205:Morrison
100:Location
422:gravmag
401:Geology
248:Gallery
226:Boulder
171:of the
160:Geology
124:, near
119:western
117:in the
199:, and
320:(PDF)
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203:near
187:near
430:2014
379:2022
353:2022
328:2013
113:are
109:The
236:or
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