Pinal Schist is the basement rock of southeastern Arizona. According to Dr. Arend Meijer, it possesses many of the characteristics of of a subduction complex associated with a Paleoproterozoic (1.64-1.7 G.y.) Mazatzal volcanic arc. The Pinal is well exposed throughout southern Arizona, but it true identity remains enigmatic.
Photo Date: May 2016
Latitude: 33.3479277778
Longitude: -111.131630556
Photo Tags: Pinal Schist, Mesoproterozoic, milky quartz 
