NABSQNO 13R-586723-3250098An unnamed buttress natural arch in Presidio County, Texas Photo by John Burns NABSQNO 13R-586723-3250098. This unnamed buttress natural arch has eroded through granite. Although small, it is unusual because it is part of a cluster of small arches through granite, a fairly uncommon occurrence. It is located in southern Presidio County, Texas. Access is via a rough dirt road leading north from highway 170.
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