Mercur, Utah - 7.5 Minute Series Topo Map SH-1B Cottrell's expertise shines through in

Cottrell's expertise shines through in his meticulous route descriptions

The Paradox Basin straddles the Utah-Colorado State line in the north central part of the physiographic province and is an area in which thick beds of rock salt were deposited some 300 million years ago

combined with the sheer beauty of the aerial panoramas

Copper-Gold and Other Polymetallic Mineralization at the Dugway Mining District

Mercur, Utah - 7.5 Minute Series Topo Map SH-1B Cottrell's expertise shines through inThe 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