Laramie, Wyoming - 30x60 Minute USGS Topographic Map Backpacking The Clarkston and Portage quadrangles

The Clarkston and Portage quadrangles lie astride the boundary between the Basin and Range and Middle Rocky Mountains physiographic provinces

and part of the Bear River delta

synclines and flexures whose axes trend northeastward

s ground-water resources

Laramie, Wyoming - 30x60 Minute USGS Topographic Map Backpacking The Clarkston and Portage quadranglesThe 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