The Custer Gallatin National Forest on Friday authorized a controversial land swap involving more than 15 square miles of land in two different south-central Montana mountain ranges.

Ranger naturalist George D. Marler meticulously documented changes in hydrothermal activity in the geyser basins of ...

Deep within the Yellowstone Caldera, the bowl-shaped rock cauldron at the heart of Yellowstone National Park, there’s a clue ...