Nogales, Arizona - 30x60 Minute Series Topo Map Multihazard Studies field work in the western

field work in the western states and Alaska

Recent incision by the Virgin and Santa Clara Rivers and their tributaries exposed the multi-colored strata and created several major gravel terraces

Piecing together the Triassic/Jurassic Stratigraphy along the south flank of the Uinta Mountains

and public officials would like to have a scientific basis for determining recommended densities/lot sizes for septic-tank systems as a land-use planning tool

West Mountain was deformed by Late Cretaceous to early Tertiary contractional folding and faulting of the Sevier orogeny

Nogales, Arizona - 30x60 Minute Series Topo Map Multihazard Studies field work in the westernThe 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