Devils Tower National Monument in Wyoming is another very interesting location with columnar basalt in the US.
Devils Tower rises 1267 feet above the Belle Fourche River. Originally below the surface, Devils Tower is now exposed due to erosion of sedimentary rocks that surrounded it millions of years ago. NPS states that the top of Devils Tower is about the size of a football field!
President Theodore Roosevelt proclaimed Devils Tower the first national monument in 1906.
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