Jackson Lake, Wyoming - 30x60 Minute USGS Topographic Map Basic Illustrated OG-21 Petroleum geology of the

OG-21 Petroleum geology of the Harley Dome field

It covers the entire Four Corners Region including the southern halves of Utah and Colorado

• Inch/centimeter rulers (global) or metric scales (metric only) for accurate and effective map work

and mountain biking

Jackson Lake, Wyoming - 30x60 Minute USGS Topographic Map Basic Illustrated OG-21 Petroleum geology of theThe 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