NABSQNO 13S-484195-4384690An unnamed caprock natural arch, Jefferson County, Colorado Photo by Brian Price NABSQNO 13S-484195-4384690. 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 Seventeenth Hole Arch. It has a span of about 18 feet.
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