Volcanoes and contact metamorphism (existing rocks exposed to magma) have played an important role in the geologic history and diverse mineral composition of Arizona. From 1.8 billion years ago during ...
William Ascarza Special to the Arizona Daily Star Jan 8, 2023 Jan 8, 2023 Updated Feb 13, 2024 Arizona has the distinction of many mine sites that have diverse geology and mineralogy. Located 20 miles ...
A view of the Stikine River near Wrangell and Petersburg. (Courtesy Cindi Lagoudakis) A geologist who has studied Southeast Alaska’s rocks and minerals for decades is creating a new geologic map of ...
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