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 Wyoming resources on About.com:
Wyoming Geography, State Symbols & Facts
Wyoming National Parks
Wyoming State Parks, Winter
Wyoming State Parks, Spring
Wyoming Scenic Roads
Wyoming Bed & Breakfasts