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Other geologists have referred to the alcove as an arch, so it's confusing to hear that you claim that it's not an arch.
![Call of the Canyon: Zion National Park [FULL DOCUMENTARY]](http://i.ytimg.com/vi/VNW5IQg2Mbs/mqdefault.jpg)
Other geologists have referred to the alcove as an arch, so it's confusing to hear that you claim that it's not an arch.