The Santa Catalina Mountains are part of a metamorphic core complex that formed 25 to 20 Ma (Oligocene-Miocene) during extension that preceded ongoing Basin and Range extension. You can download the accompanying map and two additional cross sections at: http://repository.azgs.az.gov/uri_gin/azgs/dlio/767 Bykerk-Kauffman, A., 2008, Geologic Map of the Southeastern Santa Catalina Mountains, Pima County, Arizona: Arizona Geological Survey Contributed Map CM-08-A, map scale 1:24,000, 2 map sheets.
Photographer: Anna Bykerk-Kauffman
Photo Date: 2008
Photo Location Accuracy: Approximately Located
Photo Tags: Santa Catalina Mountains, metamorphic core complex, Oligocene, Miocene 
