In 2015, a 250-ton rock slab threatened to crush a power plant at Glen Canyon Dam, an earthquake rattled the Phoenix metropolitan area, and the Tucson Gem, Mineral and Fossil show fueled the Tucson economy to the tune of $120 million. And these were a just a few of the notable geology-related stories that impacted Arizona in the past 12 months.
This short pictorial of the Pinacate Volcanic Fields, which includes stereo pairs of aerial photographs, is the latest in Dan Lynch's many expositions on the volcanoes of the Gran Desierto de Altar in northwestern Sonora, Mexico.
Interview with Dr. Spencer Titley, Professor of Geosciences Emeritus, Department of Geosciences, University of Arizona, on the history of porphyry copper exploration in Arizona.
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.
It was 1943 and World War II raged on and Allied Forces were on the offensive in the Pacific and European theaters. Back home mineral exploration for critical minerals was essential to the war effort. As part of this effort, geologists of the Arizona Bureau of Mines meticulously mapped the geology of the copper-rich Superior mining area of Arizona.
A recent paper in the journal Science reported on evidence they obtained documenting an ancient Grand Canyon of about 70 Ma (million years). The date is more than ten times the age that most of those in the photograph ascribe to the canyon.