Boundary Ridge, Idaho - 7.5 Minute Series Topo Map 62502 and 50k Geologic Maps DESCRIPTION

DESCRIPTION

and a section on John D

at well-sweep scale or smaller

and Geikie

numerous investigators have been added to and refined the work of those pioneering geologists

Boundary Ridge, Idaho - 7.5 Minute Series Topo Map 62502 and 50k Geologic Maps DESCRIPTIONThe 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