NABSQNO 15S-541690-3995915An unnamed buttress natural arch, Marion County, Arkansas Photo by John Burns NABSQNO 15S-541690-3995915. This unnamed buttress natural arch has eroded through St. Peter sandstone. It is located in a bluff above the Buffalo River in southeast Marion County, Arkansas, about 5 miles northwest of the small community of Cozahome. The arch is on federal land that is part of the Buffalo National River complex. It has a span of about 20 feet.
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