Dos Cabezas Mountains -Geology

Cochise College    
Geology of Southeastern Arizona
Geology Home Page

Roger Weller, geology instructor

wellerr@cochise.edu    last edited:  10/10/16


topographic map of Dos Cabezas Mountains, Cochise County, Arizona

 

Dos Cabezas Mountains

 

General Geology

            Sixty percent of the Dos Cabezas range is a complex exposure of metamorphosed Precambrian sedimentary rocks and igneous intrusions.  These Precambrian rocks (1 to 1.2 billion years old) are overlain by Paleozoic and Mesozoic sediments. During the Laramide orogeny (150 to 50 million years ago) the Dos Cabezas range was broken by faulting.
 

The rocks of these mountains record a history of four intense metamorphic and intrusive periods.  The first event was the metamorphism that resulted in the formation of the Precambrian Pinal Schist, approximately 1700 million years ago.  The second major event was characterized by intense plutonism and tectonism between 1450 and 1375 million years ago.  The area was intruded two more times by volcanic rocks that were dated to be 75 to 50 million years ago and 35 to 29 million years ago.
 

Maps of the Dos Cabezas Mountains 
 

Published references on the Dos Cabezas Mountains

-------------------------------------------------------