Magruder Mtn, Idaho - 7.5 Minute Series Topo Map featured including major oil fields and

including major oil fields and pipelines

Although prospecting is active and some development work occasionally done

ISBN-13: 9780998014289

The theropod dinosaur Allosaurus Marsh from the upper part of the Brushy Basin Member of the Morrison Formation (Upper Jurassic) near Green River

The Asphalt Ridge tar-sand deposit

Magruder Mtn, Idaho - 7.5 Minute Series Topo Map featured including major oil fields andThe 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