Grand Jct Topo, Colorado - 30x60 Minute Series Topo Map plants additional tar sand deposits are

additional tar sand deposits are located elsewhere along Asphalt Ridge

Idaho offers hikers some of the most magnificent and rugged mountain scenery in the Lower 48 as well as peaceful alpine meadows

Grand Teton & Yellowstone National Parks are the heart of the American Rockies

Detailed color maps and diagrams clearly distill the state’s complex bedrock geology

a stratigraphic column for the South Flank of the Uinta Mountains

Grand Jct Topo, Colorado - 30x60 Minute Series Topo Map plants additional tar sand deposits areThe distinctive characteristic of a topographic map is that the shape of the Earth's surface is shown by contour lines. Contours are imaginary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steepness of slopes. A topographic map shows more than contours. The map also includes