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Devils Tower National Monument Wyoming

Devils Tower was established as the first United States National Monument on September 24, 1906 by President Theodore Roosevelt. Devils Tower is an laccolithic butte made up of igneous rock in a section of the Black Hills called the Bear Lodge Mountains. The tower has a dramatic rise of 1,267 feet above the Belle Fourche River, is 867 feet from its base to the summit with the summit being 5,112 feet above sea level. The oldest rocks that can be seen in the Devils Tower Monument were laid down in a somewhat shallow sea during the Triassic period between 195 to 225 million years ago. Until the forces of erosion began,

Devils Tower did not visibly protrude out of the landscape until the overlying sedimentary rocks eroded away. As the elements wore down the softer sandstone and shales the highly resistant igneous rock that makes up the tower survived the forces of erosion and the tower began to form. As a result of this continual ero...