Grantsville, Utah - 7.5 Minute Series Topo Map Southern California North Ogden

North Ogden

Perfectly preserved 36-million-year-old tsetse flies in Colorado

000 scale and an explanation plate-and a 18-page booklet

Grand Staircase-Escalante

then discusses the physical attributes and geologic history of the Great Basin

Grantsville, Utah - 7.5 Minute Series Topo Map Southern California North OgdenThe 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