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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.

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Display Date: 
Sunday, December 29, 2013
breccia, oxidized

March 2013 | southern Bradshaw Mountains | Yavapai County.
Framework-supported Miocene conglomerate composed of subrounded to subangular granitoid pebbles, cobbles, and boulders with interstitial sandy, orange-red, arkosic matrix.  This is the basal unit of the Tertiary section in the southern Bradshaw Mountains.  The clasts become more angular down-section as this rock grades to boulder-cobble sedimentary breccia, which unconformably overlies weathered and oxidized Paleoproterozoic granodiorite.
(Photo by Brad Johnson.)