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GeoSnaps - Image of the Day

Geologic snapshots capturing Arizona’s geologic setting and mining history with a picture of the day from 1 January through 31 December 2013.

Check out previous GeoSnaps/Images of the Day.

Display Date: 
Friday, December 20, 2013
tectonics, core complex

Santa Catalina Mountains | Pima County, AZ

This granite in the Santa Catalina Mountains contains two lineations produced by shearing under high-temperature conditions. The hammer overlies the younger lineation. Farther to the right, a lineation with a trend that is about 10 degrees different indicates a different, earlier episode of shearing. (Photo by Jon Spencer.)