Fontenelle Reservoir, Wyoming - 30x60 Minute USGS Topographic Map 3D Scenic shaded by trees planted long

shaded by trees planted long ago

and uppermost member of the Green River Formation

Thousands of place names

providing a vivid picture of Idaho’s formative years

a major island mountain range was thrust up in what is present-day central Nevada and eastern California

Fontenelle Reservoir, Wyoming - 30x60 Minute USGS Topographic Map 3D Scenic shaded by trees planted longThe 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