NABSQNO 12S-689850-4426435An unnamed caprock natural arch, Rio Blanco County, Colorado Photos by Jay Wilbur NABSQNO 12S-689850-4426435. This unnamed caprock natural arch has eroded through Mesa Verde sandstone. It is very fragile and will not likely last for long. It is located on BLM land west of Colorado Highway 139 near mile marker 63, about 9 miles south of Rangely in Rio Blanco County, Colorado. It has a span of 17 feet.
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