Turtle Canyon, Utah - 7.5 Minute Series Topo Map Shelf 17 ECONOMIC GEOLOGY

ECONOMIC GEOLOGY

The half-lives of many of the radioactive isotopes are enormous

Drilled sidewall cores aid in interpretation of the Tertiary Wasatch Formation

s industrial minerals industry 1996-1999

collecting

Turtle Canyon, Utah - 7.5 Minute Series Topo Map Shelf 17 ECONOMIC GEOLOGYThe 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