Crater Lake, Oregon - 30x60 Minute Series Topo Map Christa Sadler an index to geologic mapping

an index to geologic mapping used to create the map

(3) the extent and spatial distribution of geologic formations having good potential for high-calcium limestone production

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ground-water compartments

Crater Lake, Oregon - 30x60 Minute Series Topo Map Christa Sadler an index to geologic mappingThe 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