Boulder Mountain, Utah - 7.5 Minute Series Topo Map Frontier Life Spiral Jetty (1970)

Spiral Jetty (1970)

grabens above salt wells

and Rich County

Load up now for a rockin' good time

Flaming Gorge Dam

Boulder Mountain, Utah - 7.5 Minute Series Topo Map Frontier Life Spiral Jetty (1970)The 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