Picacho Peak, Utah - 7.5 Minute Series Topo Map SAN RAFAEL SWELL Outstanding color photography

Outstanding color photography

STRUCTURAL GEOLOGY AND VOLCANISM

By: Barbara Fifer and Martin Kidston

principally stone and sand and gravel have provided almost 75 percent of the cumulative mineral value produced in Box Elder County through 1974

Picacho Peak, Utah - 7.5 Minute Series Topo Map SAN RAFAEL SWELL Outstanding color photographyThe 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