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 ...

USGS has unveiled its most detailed national geologic map, giving the public a free, interactive way to explore underground features. Here’s how to use it.

When it comes to hiking through Arizona, it's hard not to become some kind of geology expert. I've likened it to someone visiting a foreign country who does not speak the language. After a few weeks, ...