NABSQNO 13S-241670-4075535Outcrop Arch, San Juan County, New Mexico Photo by Larry Beck NABSQNO 13S-241670-4075535. Outcrop Arch is a small but photogenic caprock natural arch eroded through San Jose Formation sandstone. It is located in Potter Canyon, about 6 miles southeast of Aztec, San Juan County, New Mexico. Access is via mineral exploration roads (dirt) between highways 575 and 173. The arch has a span of about 4 feet.
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