A Geoscience Digital Image Library

TitleDevils Tower, northestern Wyoming, USA
DescriptionThe nearly vertical monolith known as Devils Tower rises 1,267 feet above the meandering Belle Fourche River in northeastern Wyomning. Although there is some debate, most geologists believe the tower is a volcanic neck or plug, a remnant of an ancient volcanic feature. The rock is termed a phonolite porphyry; it is a light to dark-gray or greenish-gray igneous rock with conspicuous crystals of white feldspar. As the magma cooled, hexagonal (and sometimes 4-, 5-, and 7-sided) columns formed.
LocationUSA ▹ Wyoming. Near Belle Fourche. Devils Tower National Monument.
PhotographerDexter Perkins. 1988.
Key wordsDevils Tower, phonolite, porphyry, Wyoming, volcano
Tech details579 KB. Vista. Photographed with Canon A1 Camera; Kodachrome II.
GeoDIL number805