Bowtie Arch, also known as Pinto Arch, is a good example of a pothole arch, where water first eroded a large pothole or water tank atop the sandstone cliff. Additional chemical and mechanical erosion wore through the bottom of the pothole. The result is a hole in the bottom of the pothole. Subsequent erosion, sometimes due to rainstorm runoff, has enlarged this hole creating the arch you see today.
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