Vegetation bordering a Yellowstone canyon at Undine Falls.
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Autumn at Undine Falls
Vegetation bordering a Yellowstone canyon at Undine Falls.
Autumn at Undine Falls
Vegetation bordering a Yellowstone canyon at Undine Falls.
Vegetation bordering a Yellowstone canyon at Undine Falls.
Little Missouri River near Camp Area C at Albert Pike Recreation Area
Little Missouri River near Camp Area C at Albert Pike Recreation AreaLittle Missouri River near Camp Area C at Albert Pike Recreation Area, Arkansas (photograph by Daniel M. Wagner, U.S. Geological Survey).
Little Missouri River near Camp Area C at Albert Pike Recreation Area
Little Missouri River near Camp Area C at Albert Pike Recreation AreaLittle Missouri River near Camp Area C at Albert Pike Recreation Area, Arkansas (photograph by Daniel M. Wagner, U.S. Geological Survey).
Extremophilic Microbial Mats
Water run off from the Excelsior geyser hot spring. Various extremophilic microbial mats (Domains Archaea and Eubacteria) living in the hot springs, acidic habitats, and geyser basins. Notice the bands of color as microbial populations separate according to their tolerance for differing temperature and/or pH gradients.
Water run off from the Excelsior geyser hot spring. Various extremophilic microbial mats (Domains Archaea and Eubacteria) living in the hot springs, acidic habitats, and geyser basins. Notice the bands of color as microbial populations separate according to their tolerance for differing temperature and/or pH gradients.
San Juan Geomagnetic Observatory
Cayey, Puerto Rico geomagnetic observatory.
Cayey, Puerto Rico geomagnetic observatory.
Snake River and Hints of Autumn
A portion of the Snake River as it winds its way through Yellowstone National Park.
A portion of the Snake River as it winds its way through Yellowstone National Park.
San Juan Geomagnetic Observatory
Absolutes, variations and proton buildings at Cayey magnetic observatory, Puerto Rico.
Absolutes, variations and proton buildings at Cayey magnetic observatory, Puerto Rico.
Autumn Vista Along the Snake River
Autumn foliage on the Snake River.
Autumn Vista Along the Snake River
Coniferous trees along the Snake River.
Coniferous trees along the Snake River.
Ranchlands, Utah and Idaho
Roadsides, ranchlands, and mountains.
Roadsides, ranchlands, and mountains.
Ranchlands, Utah and Idaho
Roadsides, ranchlands, and mountains.
Roadsides, ranchlands, and mountains.
Autumn Mountain Byways
Byways and Mountains in Autumn.
Byways and Mountains in Autumn.
Remnants of a spruce forest
Remnants of a spruce forest complex following a severe wildfire in the Yukon Flats National Wildlife Refuge, Alaska. Wildfires are the dominant landscape-scale disturbance operating at annual time scales in Alaska, and fires play a major role in the rate and extent of vegetation growth and productivity of a site.
Remnants of a spruce forest complex following a severe wildfire in the Yukon Flats National Wildlife Refuge, Alaska. Wildfires are the dominant landscape-scale disturbance operating at annual time scales in Alaska, and fires play a major role in the rate and extent of vegetation growth and productivity of a site.
Aneides aeneus (green salamander)
Aneides aeneus (Green salamander) Howards Waterfall Cave, Southeastern Cave Conservancy Preserve, Dade County, Georgia 1.
Aneides aeneus (Green salamander) Howards Waterfall Cave, Southeastern Cave Conservancy Preserve, Dade County, Georgia 1.
Cannonball River
Looking west at the Cannonball River at Breien, ND.
Looking west at the Cannonball River at Breien, ND.
Cannonball River
The Cannonball River looking East.
The Cannonball River looking East.
Walrus High on the Barrier Island Beaches Near Pt Lay, AK
Walrus High on the Barrier Island Beaches Near Pt Lay, AKWalruses gathered on Alaskan shores of the Chukchi Sea by the tens of thousands in late August and September of 2010 after the last of the sea ice dissipated.
Walrus High on the Barrier Island Beaches Near Pt Lay, AK
Walrus High on the Barrier Island Beaches Near Pt Lay, AKWalruses gathered on Alaskan shores of the Chukchi Sea by the tens of thousands in late August and September of 2010 after the last of the sea ice dissipated.
Cow with Her Yearling Calf on the Beach Near Pt. Lay, AK
Cow with Her Yearling Calf on the Beach Near Pt. Lay, AKWalruses gathered on Alaskan shores of the Chukchi Sea by the tens of thousands in late August and September of 2010 after the last of the sea ice dissipated.
Cow with Her Yearling Calf on the Beach Near Pt. Lay, AK
Cow with Her Yearling Calf on the Beach Near Pt. Lay, AKWalruses gathered on Alaskan shores of the Chukchi Sea by the tens of thousands in late August and September of 2010 after the last of the sea ice dissipated.
Rogue River, Oregon
Rogue River Canyon in southwest Oregon
Rogue River Canyon in southwest Oregon
Juvenile Mountain Yellow-legged Frog
Juvenile mountain yellow-legged frog in San Bernardino County, California.
Juvenile mountain yellow-legged frog in San Bernardino County, California.
Walrus Resting in the Evening Sun Near Pt Lay, AK
Walruses gathered on Alaskan shores of the Chukchi Sea by the tens of thousands in late August and September of 2010 after the last of the sea ice dissipated.
Walruses gathered on Alaskan shores of the Chukchi Sea by the tens of thousands in late August and September of 2010 after the last of the sea ice dissipated.