NABSQNO 13S-484175-4384790An unnamed caprock natural arch, Jefferson County, Colorado Photo by Brian Price NABSQNO 13S-484175-4384790. This unnamed caprock natural arch has eroded through adjacent layers of Fountain Formation sandstone. It is located in a golf course community southwest of Denver, Jefferson County, Colorado. Because of this, it has occasionally been called Eighteenth Hole Arch. It has a span of about 12 feet.
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