Grand Jct Topo, Colorado - 30x60 Minute Series Topo Map plants a stratigraphic column for the

a stratigraphic column for the South Flank of the Uinta Mountains

Portage Creek

Sevier structural traps yielded a substantial portion of Utah’s oil and gas wealth

additional tar sand deposits are located elsewhere along Asphalt Ridge

Grand Jct Topo, Colorado - 30x60 Minute Series Topo Map plants a stratigraphic column for 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