Lysite, Wyoming - 30x60 Minute USGS Topographic Map Birds The high Wind River Mountains

The high Wind River Mountains of Wyoming give birth to the Green

The oversize baseplate is ideal for accurate triangulation

Professional photos: Crisp

The Rock and Gem Book is the perfect encyclopedia for young geologists to consult

Early Ordovician eustatic sea-level changes in northern Utah and southeastern Idaho

Lysite, Wyoming - 30x60 Minute USGS Topographic Map Birds The high Wind River MountainsThe 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