Grand Jct Topo, Colorado - 30x60 Minute Series Topo Map plants Portage Creek

Portage Creek

a stratigraphic column for the South Flank of the Uinta Mountains

Exposed strata are Tertiary in age and include the Flagstaff Formation which is mapped in six informal members

The recent activity shown on this map provides only a present-day snapshot of Earth's long history

Grand Jct Topo, Colorado - 30x60 Minute Series Topo Map plants Portage CreekThe 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