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Wyoming Geologic Map

Geologic Maps of the 50 United States


Wyoming is the second-highest American state after Colorado, rich in minerals and scenery alike. (more below)
Wyoming's rocks

Created by Andrew Alden from the U.S. Geological Survey's Geologic Map of the United States, 1974, by Philip King and Helen Beikman (fair use policy)

Click the map for a larger version
Wyoming's mountain ranges are all part of the Rockies, mostly the Middle Rockies. Most of them have very old rocks of Archean age in their cores, shown here by brownish colors, and Paleozoic rocks (blue and blue-green) on their flanks. The two exceptions are the Absaroka Range (upper left), which is young volcanic rocks related to the Yellowstone hotspot, and the Wyoming Range (left edge), which is faulted strata of Phanerozoic age. Other major ranges are the Bighorn Mountains (top center), Black Hills (top right), Wind River Range (left center), Granite Mountains (center), Laramie Mountains (right center) and Medicine Bow Mountains (bottom right center).

Between the mountains lie large sedimentary basins (yellow and green), which have large resources of coal, oil and gas as well as abundant fossils. These include the Bighorn (top center), Powder River (top right), Shoshone (center), Green River (lower left and center) and Denver Basin (lower right). The Green River basin is especially noted for its fossil fish, common in rock shops around the world.

Among the 50 states, Wyoming ranks first in coal production, second in natural gas and seventh in oil. Wyoming is also a major uranium producer. Other prominent resources produced in Wyoming are trona or soda ash (sodium carbonate) and bentonite, a clay mineral used in drilling muds. All of these come from the sedimentary basins.

In Wyoming's northwest corner is Yellowstone, a dormant supervolcano that hosts the world's largest assemblage of geysers and other geothermal features. Yellowstone was the world's first national park, although California's Yosemite Valley was reserved a few years earlier. Yellowstone remains one of the world's premier geological attractions for both tourists and professionals.

The University of Wyoming has the much more detailed 1985 state map by J. D. Love and Ann Christianson.

More about Wyoming Geology

More Wyoming resources on About.com:
Wyoming Maps
Wyoming Geography, State Symbols & Facts
Wyoming National Parks
Wyoming State Parks, Winter
Wyoming State Parks, Spring
Wyoming Campgrounds
Wyoming Scenic Roads
Wyoming Forests
Wyoming Fishing
Wyoming Hunting
Wyoming Skiing
Wyoming Rodeo
Wyoming Bed & Breakfasts

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