Long Valley, Idaho - 7.5 Minute Series Topo Map Paleogeography Pages: 542

Pages: 542

This map is based on limited field mapping and aerial photograph interpretation

revealing regional patterns of gas shows in the Mancos and Hermosa

are the sources for the asphaltic crude found in the upper Green River

Long Valley, Idaho - 7.5 Minute Series Topo Map Paleogeography Pages: 542The 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