Images

Knik River bridge

USGS scientist Louis Sass examines a full firn core taken on Wolverine Glacier, making observations of any notable dust or dirt layers in the snow and firn stratigraphy.

Brian Robinson holding a herring dip net of forage fish in Cook Inlet, Alaska

Black-legged Kittiwake with a herring in it's bill. These seabirds were foraging near Gull Island in Cook Inlet, Alaska.

The photo was taken by Erin Todd during helicopter-supported geologic fieldwork in Lake Clark National Park this past summer.

Black-legged Kittiwakes foraging for fish in Cook Inlet, Alaska.

USGS research geologist Jamey Jones collects multiple samples of rocks exposed in a glacial stream valley near Lake Clark.

USGS research geologist Jamey Jones stands on a dike of granite intruding darker granodiorite, with helicopter in background.

USGS research geologists Richard Lease (left) and Jamey Jones (right) take notes and collect samples of fine-grained metamorphic rock hosted as an inclusion in coarser-grained granodiorite. 

USGS research geologists Jamey Jones (left) and Richard Lease (right) make observations of rock units revealed by the glacier below.

Fire ecologists discuss wildfire impacts at a repeat fire site in Wrangells-St. Elias National Park, AK

Limnocorral on McKinley Lake, near Cordova, Alaska for Elodea spp. experiment. This experiment is studying the effect of the invasive species Elodea spp. on aquatic ecosystems. Disclaimer statement: Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Chinook salmon restrained in a cradle after non-lethal muscle biopsy sample collection for heat stress assessment at a subsistence fish wheel in the Yukon River during July 2017. The muscle biopsy location looks like one of the black spots on the back of the fish.

A melanistic (all dark) Common Murre stands near the base of the Gull Island breeding colony in Kachemak Bay, Alaska, 2017. See related paper published in the Marine Ornithology: Journal of Seabird Research and Conservation at: http://www.marineornithology.org/PDF/50_2/50_2_225-227.pdf.

A Common Murre holding a juvenile Pacific Herring at its colony on Gull Island, Cook Inlet on July 3, 2017.

Male Wilson's Warbler on the Seward Peninsula, Alaska. This photo was taken on the Seward Peninsula as part of the Changing Arctic Ecosystems Boreal-Arctic Transition Zone program.

Male Wilson's Warbler.  This photo was taken on the Seward Peninsula as part of the Changing Arctic Ecosystem Boreal-Arctic Transition Zone program.

USGS scientists deploy a seismic streamer aboard the R/V David Starr offshore of southeast Alaska to study the Queen Charlotte Fault.

McKinley Lake, outside of Cordova, Alaska. This is the site of deployment of limnocorrals for an Elodea spp. experiment. 

Research vessel Ocean Starr in Alaska.

USGS Geologist George Case examines granitic rocks in preparation for collecting samples for geochemistry and geochronology near the Boulder Creek prospect at the north end of the Darby pluton on the eastern Seward Peninsula.