Ranger naturalist George D. Marler meticulously documented changes in hydrothermal activity in the geyser basins of Yellowstone National Park for more than three decades in the mid-20th century. His work was especially useful in understanding the significant changes in hydrothermal activity following the August 1959 M7.3 Hebgen Lake, Montana, earthquake.

It's too early to say what Republican plans will take root in Congress, but already there are proposals to both sell off federal lands and pull back National Park Service funding budgeted for helping parks respond to climate change.

Massive prescribed fire requires multi-jurisdictional agencies to cooperate.

Deep within the Yellowstone Caldera, the bowl-shaped rock cauldron at the heart of Yellowstone National Park, there’s a clue that any future eruption will occur near the northeastern edge of the caldera.