Monday, February 13, 2012


The landscapes of Death Valley are abundant with examples of faulting. The picture below is of the Furnace Creek Badlands in Death Valley. The mountains are marked with what is called normal faulting by extension. Extension occurs when the stress being applied to the rock is in opposite directions and pulls apart the rock. The process of extension leads to a form and process called stretching. Eventually the rock can break under this stress to create normal faults by extension. The many triangular facets along the sides of the mountains and the wine glass valleys forming along the base of the mountains are forms in which the process of faulting by extension manifests itself.

                                               Photo Credit: http://library.byways.org/

This particular mountain below possesses numerous examples of diastrophism all along its surface. The thick white layer running along the side shows folding. Its folding comes in the form of anticlines (convex bends upward) and synclines (concave bends in a depression). This was accomplished through stresses being applied against each other from opposite sides. This type of process is called compression and it can lead to the rock deforming in the manner of folding.

                                                     Photo Credit: http://www.pitt.edu/

Towards the right side of the mountain, the white layer of rock breaks cleanly only to continue above unconnected. This would be an example of strike-slip faulting left lateral. More towards the center of the mountain there appears to be a strike-slip fault in the right lateral direction. Strike-slip faults are created by side by side lateral stress (from the perspective of looking along the layer) in opposite directions; this process (called shearing) warps and deforms the rock horizontally (from the perspective of looking along the layer), which can lead to the strike-slip faults shown above.