NABSQNO 12S-696640-4330955Window Rock in Colorado National Monument, Colorado Photo by Jay Wilbur NABSQNO 12S-696640-4330955. Window Rock is a caprock natural arch eroded through alternating layers of Kayenta sandstone. It is located above North Entrance Canyon, near the vistor center, in Colorado National Monument, Mesa County, Colorado. Vreeland included this arch in his catalog as number 18-13, and reported a span of about 15 feet.
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