Reduction spot, Red Hills, near Tucson, Arizona


I collected this in the late 1980’s in the Red Hills in the Tucson Mountains, while engaged in a class mapping project with graduate students.  I like the mystery of such spots, and particularly enjoy having such an ‘undeformed’ reduction spot as a reference to how things may have looked before a deformation creates strongly ellipsoidal reduction spots.

Age & Formation
Recreation Red Beds Formation of Jurassic age, ~180 Ma.