The Granite Basin laccolith is located in the Mescal Mountains of the San Carlos Indian Reservation, 15 miles ENE of Kearny, Arizona. According to Willden (1964), the feldspar-mica porphyry intruded the Naco Limestone about 62 Ma. Locally, the Pennsylvanian Naco strikes northwesterly and dips about 25 to 30 degrees to the southwest. At the southeastern end of the laccolith, the Naco Limestone is nearly vertical and strikes to the northeast.
- I continue to marvel at the realization that I was one of those fortunate geologists to have a career spanning this revolutionary period in the earth sciences, and marvel at how much it’s simply taken for granted that plate tectonics is a fact of geologic life today.
Two University of Arizona GeoPathways interns, Iaos Lizarazu and Jake Ridlinghafer, are assisting Ann Youberg (UA AZGS) and Luke McGuire (UA Geosciences) with collecting post-wildfire debris flow data this summer.
The text below is taken directly from Jon Spencer’s introduction to this posthumous release of William R. Dickinson notes and illustrations on the Cretaceous and Laramide of the Colorado Plateau.
America’s infrastructure is built of sand, gravel, and crushed rock; collectively referred to as aggregate. And that is the topic of our 45th episode of the Arizona Mining Review - an interview with Eric Mears on gravel production and consumption in the Phoenix Metro area.
William B. White, Ph.D. and Professor Emeritus at Penn State’s Dept. of Geochemistry, is one of the world’s great authorities on cave formation and cavern features.
The Arizona Geological Society will host Dr. White’s presentation, ‘The Science of Caves and Cave Contributions to Science’. This hour-long presentation, with 15-minutes for questions, will paint a ‘broad brush overview of cave sciences in the 21th Century.’
- Author, geologist, and mining historian David Briggs' new contributed report, ‘History of the Verde Mining District, Jerome, Arizona’, revisits the long mining history of Jerome.
For 85 years, ending in 1996, the US Bureau of Mines (USBM) drafted and released 1000s of seminal reports on mineral resources and mining technology in the United States. The contents of those reports still have value. Unfortunately, access to USBM reports frequently proves difficult.