Latest Articles

Spencer Titley

Interview with Dr. Spencer Titley, Professor of Geosciences Emeritus, Department of Geosciences, University of Arizona, on the history of porphyry copper exploration in Arizona.

Lee Allison's 2013 Arizona Geology Blog

Some of the top geologic stories from Lee Allison’s Arizona Geology blog for 2013.

"Head of the Grand Canyon" woodcut image

In this article, we present some of the highlights of the geological exploration of Arizona, focused on the role of early surveys by the U.S. Government and later geologic studies by the USGS and the AZGS and its predecessors.

Map of southwestern North America showing the outline of the drainage basin for the upper Colorado River

 A brief review of the significance of Arizona geology in development of concepts associated with these features, presented in commemoration of the 125th anniversary of the Arizona Geological Survey and its predecessors.

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125 Years - Arizona Geological Survey

The Arizona Geological Survey celebrated its 125th anniversary in 2013, tracing our origins back to the creation of the Office of Territorial Geologist in 1888, 25 years before Arizona became a state.