Jim Sage Canyon, Idaho - 7.5 Minute Series Topo Map Cambrian Numerous smaller towns sprang up

Numerous smaller towns sprang up to service the railroad

By: Leslie Kelen

stately wolf

Other exploited and potential geologic resources include phosphate

Trust Lands

Jim Sage Canyon, Idaho - 7.5 Minute Series Topo Map Cambrian Numerous smaller towns sprang upThe 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