Figures and pictures used
with permission from "Windows into the Earth, The
Geologic Story of Yellowstone and Grand Teton
National Parks", Robert B. Smith and Lee J. Siegel,
Oxford University Press, 2000.
Space view of Grand Teton and Yellowstone national
parks from satellite images overlaid on digital
elevation maps. The 8,000-foot-high Yellowstone
caldera (marked III) was produced by a giant volcanic
eruption 630,000 years ago. The caldera occupies a
45-by-30-mile-wide area of central Yellowstone.
Partial boundaties of the calderas formed 2 and 1.3
million years ago are marked I, and II respectively.
Computer image by E.V. Wingert.
