NABSQNO 12T-689395-4430975An unnamed cave natural arch, Rio Blanco County, Colorado Photo by Jay Wilbur NABSQNO 12T-689395-4430975. This unnamed cave natural arch has eroded through Mesa Verde sandstone. It is located on the west side of Colorado Highway 139 near mile marker 66, about 6 miles south of Rangely in Rio Blanco County, Colorado. The opening is small.
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