Overton, Nevada - 30x60 Minute USGS Topographic Map Southern California Their symmetrical forms and elegant

Their symmetrical forms and elegant simplicity-and occasionally baroque ornamentation- combine with the pleasing rhythms of their segmentation to captivate and delight the eye

000 scale with an explanation plate-and a 14-page booklet describing the geology of the quadrangle

subsiding basin

North American Datum 1927

aesthetics

Overton, Nevada - 30x60 Minute USGS Topographic Map Southern California Their symmetrical forms and elegantThe 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