by The American Geosciences Institute Thursday, October 1, 2015
The pointed hoodoos of this national monument are formed from layers of pumice, tuff, ash and conglomerates that were originally deposited more than 300 meters deep in some places by Late Miocene volcanic eruptions.
Small weather-resistant boulders helped create the distinct shape (likely familiar to hikers) of the formations, which range in height from about a meter up to about 27 meters, as softer rock below the caprocks eroded.
Archaeological evidence suggests humans inhabited the area 4,000 years ago. The indigenous name for the area translates to “white cliffs,” likely a reference to ledges lining the steep-sided canyons also found in this area, which was designated a national monument in 2001.
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Answer: The pointed hoodoos of Kasha-Katuwe Tent Rocks National Monument are formed from layers of pumice, tuff, ash and conglomerate that were originally deposited by Late Miocene volcanic eruptions. Archaeological evidence suggests humans inhabited the area 4,000 years ago. Photo is by Garry Hayes.
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