Images

National Atmospheric Deposition site near Gypsum Creek, Wyoming.

Buffalo on road to Canyon, Wyoming

Yellow-bellied Marmot stands on its hind legs in Yellowstone National Park. Photo by D. Dzurisin.

The water at Terrace Springs, northeast of Madison Junction in Yellowstone National Park, is relatively cold (about 60 °C or 140 °F), but the water is still saturated with CO₂-rich bubbles. Photo by Shaul Hurwitz in September 2008.

A sulfur flow over acid-sulfate ground at Brimstone Basin near the eastern shore of Yellowstone Lake. The flows formed when native sulfur deposits were ignited during a forest fire. Photo by Shaul Hurwitz, September 2008.

Measuring streamflow in Fish Creek with large Cladophora growth

Roadcut in light pink ash-flow deposits of the Lava Creek Tuff on Grand Loop Road near Tuff Cliff.  The color and closely spaced jointing are characteristic of the Lava Creek Tuff map unit.  The steep faces and dense nature of the roadcut exposures indicate that a moderate degree of welding occurred and has not been subsequently modified by hydrothermal al

Lower Falls and Grand Canyon of the Yellowstone River.  The river here is eroding young, post-caldera rhyolite that was softened by hydrothermal alteration.  The V shape of the canyon indicates that the river is actively eroding in response to regional uplift.  Photo by Richard Tollo, George Washington University, August 12, 2008.

Narrow Gauge spring, Mammoth Hot Springs, Yellowstone National Park.  Vent area is between the two trees on top of the travertine deposits.  Terraced pools form due to deposition of travertine from the fluids as they cool and degas carbon dioxide.

GPS station P714, located in Panther Meadow south of Mammoth Hot Springs in Yellowstone National Park. Photo by EarthScope Consortium, June 2008.

Supplemental feeding of bison on the National Elk Refuge, Wyoming in February 2008.

Supplemental feeding of bison on the National Elk Refuge, Wyoming in February 2008.

Elk and bison being fed on the National Elk Refuge, Wyoming. Grand Teton and Grand Teton National Park are in the background.

Fish Creek, Wyoming

Aerial view of the National Elk Refuge (left) and the town of Jackson, Wyoming (right) in 2007.

An eruption of Daisy Geyser in the Upper Geyser Basin of Yellowstone National Park. The geyser erupts boiling water at about 93 °C (200 °F). Photo by Shaul Hurwitz on April 12, 2007.

National Agriculture Imagery Program natural-color image from September 9, 2006, showing newly mapped thermal areas (outlined in yellow) on the north side of the Mallard Lake resurgent dome.

Upper Lebo Member of the Fort Union Formation. Photo taken fro the top of Cow Creek Buttes in the Burnt Hollow BLM recreation area about 20 miles northeast of Gillette, Wyoming.

Single species stand of nonnative tamarisk on the Lower Colorado River at Cibola National Wildlife Refuge, California