NABSQNO 13S-387460-3963645An unnamed buttress natural arch in Los Alamos County, New Mexico Photo by Jay Wilbur NABSQNO 13S-387460-3963645. This unnamed buttress natural arch has eroded through rock of volcanic origin. It is located along highway 4 southwest of White Rock, Los Alamos County, New Mexico. It has a span of about 10 feet.
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