Duchesne SE, Utah - 7.5 Minute Series Topo Map SH-17C the Great Basin

the Great Basin

ancestral Puebloan Indian ruins and pictographs

no other single taxonomic group is as precise or as widely useful for time correlation of strata as the ammonoid cephalopods

Bedrock strata exposed within the quadrangle are from Middle Jurassic (Callovian) through late Eocene in age

Duchesne SE, Utah - 7.5 Minute Series Topo Map SH-17C the Great BasinThe 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