Big Rock Mtn, Idaho - 7.5 Minute Series Topo Map Green River Formation Distribution of Devonian Stromatoporoid Buildups

Distribution of Devonian Stromatoporoid Buildups in the Eastern Basin and Range

The cliffs of Porcupine Rim are source areas for large rock falls which can travel far out onto the alluvial fans below the cliffs

and shallow groundwater potential

Utah (UGS OFR 368)

Big Rock Mtn, Idaho - 7.5 Minute Series Topo Map Green River Formation Distribution of Devonian Stromatoporoid BuildupsThe 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