Dating topography of the sierra nevada
The character of the range is shaped by its geology and ecology. (million years) ago, and erosion by glaciers exposed the granite and formed the light-colored mountains and cliffs that make up the range.More than one hundred million years ago during the Nevadan orogeny, granite formed deep underground. The uplift caused a wide range of elevations and climates in the Sierra Nevada, which are reflected by the presence of five life zones.The Sierra Nevada mountain range is the longest and highest such range in the lower 48 United States.The maximum range of elevation is 4400 meters in the south to 2700 meters in the north with a total length approaching 643km (Hill 2006).To select pages to copy: Price lists, contact information, and order forms are available on the Duplication Services Web site.Please use the following steps to determine whether you need to fill out a call slip in the Prints and Photographs Reading Room to view the original item(s).To restore access and understand how to better interact with our site to avoid this in the future, please have your system administrator contact [email protected]
Through the analysis of rock types, chemical composition of those rocks, and the actual structures visible in the Sierra Nevada region and further east, it is apparent that many millions of years ago there was a collision between lithospheric plates on the western margin of the North American Plate.For information about assessing rights, see the Rights and Restrictions Information page.More about Copyright and other Restrictions For guidance about compiling full citations consult Citing Primary Sources.This collision caused subduction of the oceanic Farallon plate creating vast masses of magma which rose and crystallized to form the core of the mountain range we see today.
In addition to the periods of magmatic intrusion the region went through several different phases of geological setting presenting itself in the sedimentary and metasedimentary rock structures visible today.
Uplift continues due to faulting caused by tectonic forces, creating spectacular fault block escarpments along the eastern edge of the southern Sierra. The California Gold Rush occurred in the western foothills from 1848 through 1855.