Maver1ck : www.nps.gov/deto/lea rn/nature/tower-form ation.htm
@MsSims : oh wow, very interesting explanation!!!! Thanks for that, I skimmed it, will get more coffee and read carefully. In short, "Geologists agree that Devils Tower began as magma, or molten rock buried beneath the Earth's surface. What they cannot agree upon are the processes by which the magma cooled to form the Tower, or its relationship to the surrounding geology of the area."
Amazing!!!