NABSQNO 12T-671560-4485560An unnamed pothole natural arch, Moffat County, Colorado Photo by Dave Kennedy NABSQNO 12T-671560-4485560. This unnamed pothole natural arch has eroded through Park City sandstone. It is located in lower Sand Canyon, a short hike north of the Yampa Bench Road (dirt) in Dinosaur National Monument, Moffat County, Colorado. It has a span of about 8 feet.
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