Weird Geology: The Devil's Tower
http://www.unmuseum.org/devtowergeo.htm

Lee Krystek, The Museum of Unnatural Mystery


This page features a brief introduction to the several theories about the geological processes that formed Devil's Tower, which rises 1,267 feet above the nearby Belle Fourche River and is still considered a sacred place by some Native American Tribes. Information on climbing the tower as well as images and a cross section are provided.

This resource is referenced here:
Subject: Geoscience:Geology:Igneous and Metamorphic Petrology:Igneous Processes
Resource Type: Scientific Resources:Overview/Reference Work, Audio/Visual:Images/Illustrations
Topics: Time/Earth History, Earth surface