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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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Friday, December 27, 2013
basin fill, alluvial fan, erosion, San Pedro river

23 December 2013 | Dragoon Wash | near St. David, Arizona.

This photo from Dragoon Wash shows older basin fill deposits, the lower darker sedimentary unit, overlain by a thick, lighter-colored, alluvial package from the ancestral Dragoon wash. The entire sequence was later cut by the San Pedro River providing for this marvelous exposure. (Photo by Joe Cook.)