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.
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Browse images from a wide range of science topics covered by USGS. All items in this gallery are considered public domain unless otherwise noted.
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Geologist examines rocks at Darby Pluton, AK
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.
Darby Mountain outcrop of quartz monzonite
Looking east past a typical Darby Mountain outcrop of quartz monzonite towards the contact between the pluton and Paleozoic marbles
Looking east past a typical Darby Mountain outcrop of quartz monzonite towards the contact between the pluton and Paleozoic marbles
Potassium feldspar phenocrysts in syenite
Stretched phenocrysts of potassium feldspar in syenite of the Kachauik pluton on the Bering Sea coast of the southeastern Seward Peninsula.
Stretched phenocrysts of potassium feldspar in syenite of the Kachauik pluton on the Bering Sea coast of the southeastern Seward Peninsula.
Elim village children explore beach outcrops with USGS geologists
Elim village children explore beach outcrops with USGS geologistsUSGS geologists (Andy Allard, Beth Drewes-Todd and Alan Pongratz) investigating the rocks exposed on the beaches near the village of Elim with the trusty local guides and eager budding geologists.
Elim village children explore beach outcrops with USGS geologists
Elim village children explore beach outcrops with USGS geologistsUSGS geologists (Andy Allard, Beth Drewes-Todd and Alan Pongratz) investigating the rocks exposed on the beaches near the village of Elim with the trusty local guides and eager budding geologists.
Lone male Yellow Warbler on the Seward Peninsula, Alaska
Lone male Yellow Warbler on the Seward Peninsula, AlaskaLone male Yellow Warbler on the Seward Peninsula, Alaska. This photo was taken on the Seward Peninsula as part of the Changing Arctic Ecosystem Boreal-Arctic Transition Zone program.
Lone male Yellow Warbler on the Seward Peninsula, Alaska
Lone male Yellow Warbler on the Seward Peninsula, AlaskaLone male Yellow Warbler on the Seward Peninsula, Alaska. This photo was taken on the Seward Peninsula as part of the Changing Arctic Ecosystem Boreal-Arctic Transition Zone program.
Flooding stream in a permafrost landscape, Kobuk Valley National Park
Flooding stream in a permafrost landscape, Kobuk Valley National ParkA flooding stream meanders through a permafrost landscape in Kobuk Valley National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region
Flooding stream in a permafrost landscape, Kobuk Valley National Park
Flooding stream in a permafrost landscape, Kobuk Valley National ParkA flooding stream meanders through a permafrost landscape in Kobuk Valley National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region
Joel Schmutz with an Emperor Goose
Joel Schmutz holding an Emperor Goose
Joel Schmutz holding an Emperor Goose
Glaucous-winged gull in water in Kenai River, Alaska
Glaucous-winged gull in water in Kenai River, AlaskaGlaucous-winged gull in water in Kenai River, Kenai, Alaska
Glaucous-winged gull in water in Kenai River, Alaska
Glaucous-winged gull in water in Kenai River, AlaskaGlaucous-winged gull in water in Kenai River, Kenai, Alaska
Investigating a marine terrace along the Fairweather Fault
Investigating a marine terrace along the Fairweather FaultUSGS scientists Kate Scharer, Richard Lease, and Adrian Bender excavate a marine terrace elevated tens of meters above sea level on the west side of the Fairweather Fault. Location: Icy Point, Glacier Bay National Park, Alaska.
Investigating a marine terrace along the Fairweather Fault
Investigating a marine terrace along the Fairweather FaultUSGS scientists Kate Scharer, Richard Lease, and Adrian Bender excavate a marine terrace elevated tens of meters above sea level on the west side of the Fairweather Fault. Location: Icy Point, Glacier Bay National Park, Alaska.
River terraces elevated along the Fairweather Fault
River terraces elevated along the Fairweather FaultUSGS scientists Richard Lease and Adrian Bender examine river terraces elevated tens of meters above the modern channel level on the west side of the Fairweather Fault. Location: Kaknau Creek, Icy Point, Glacier Bay National Park, Alaska.
River terraces elevated along the Fairweather Fault
River terraces elevated along the Fairweather FaultUSGS scientists Richard Lease and Adrian Bender examine river terraces elevated tens of meters above the modern channel level on the west side of the Fairweather Fault. Location: Kaknau Creek, Icy Point, Glacier Bay National Park, Alaska.
Common Murres at breeding colony, Alaska-close up of egg
Common Murres at breeding colony, Alaska-close up of eggCommon Murres at their breeding colony on Gull Island, Kachemak Bay, Alaska. One of the murres standing next to egg.
Common Murres at breeding colony, Alaska-close up of egg
Common Murres at breeding colony, Alaska-close up of eggCommon Murres at their breeding colony on Gull Island, Kachemak Bay, Alaska. One of the murres standing next to egg.
Kasilof River bridge
Kasilof River bridge
Black-capped Chickadee with a deformed crossed beak
Black-capped Chickadee with a deformed crossed beakA Black-capped Chickadee with a beak that has grown long and crossed
Black-capped Chickadee with a deformed crossed beak
Black-capped Chickadee with a deformed crossed beakA Black-capped Chickadee with a beak that has grown long and crossed
Red-breasted Nuthatch with an elongated deformed beak
Red-breasted Nuthatch with an elongated deformed beakA female Red-breasted Nuthatch with an elongated deformed beak. It was captured in Anchorage as part of the beak deformity research project. Avian keratin disorder (AKD) is a disease characterized by debilitating beak overgrowth and other abnormalities of keratinized tissues.
Red-breasted Nuthatch with an elongated deformed beak
Red-breasted Nuthatch with an elongated deformed beakA female Red-breasted Nuthatch with an elongated deformed beak. It was captured in Anchorage as part of the beak deformity research project. Avian keratin disorder (AKD) is a disease characterized by debilitating beak overgrowth and other abnormalities of keratinized tissues.
Participatory Mapping
Indigenous Knowledge holders share knowledge during a participatory mapping workshop in Kotlik, AK.
Indigenous Knowledge holders share knowledge during a participatory mapping workshop in Kotlik, AK.
Torrs of the Ruby Batholith
Scintillometer and torrs of the Melozitna granite in the Ruby batholith. This granite contains abundant monazite and high levels of thorium and rare earth elements. This area is part of the Bureau of Land Management's Central Yukon Planning Area, which USGS did a mineral assessment of in 2015.
Scintillometer and torrs of the Melozitna granite in the Ruby batholith. This granite contains abundant monazite and high levels of thorium and rare earth elements. This area is part of the Bureau of Land Management's Central Yukon Planning Area, which USGS did a mineral assessment of in 2015.
A stony islet in one of the many ponds of Icy Point
A stony islet in one of the many ponds of Icy PointA stony islet in one of the many ponds of Icy Point.
A stony islet in one of the many ponds of Icy Point
A stony islet in one of the many ponds of Icy PointA stony islet in one of the many ponds of Icy Point.
Bristle-thighed Curlew in Alaska
A Bristle-thighed Curlew on the tundra. This photo was taken during the Changing Arctic Ecosystems Boreal-Arctic Transition program.
A Bristle-thighed Curlew on the tundra. This photo was taken during the Changing Arctic Ecosystems Boreal-Arctic Transition program.
ASC biologists necropsy Common Murres
ASC biologists John Piatt, Sarah Schoen, Gary Drew, and Brielle Heflin necropsy Common Murres recovered in Prince William Sound following the massive die-off of murres in 2015/2016.
ASC biologists John Piatt, Sarah Schoen, Gary Drew, and Brielle Heflin necropsy Common Murres recovered in Prince William Sound following the massive die-off of murres in 2015/2016.
Emaciated Common Murre lays on the laboratory table
Emaciated Common Murre lays on the laboratory tableAn emaciated Common Murre lays on the laboratory table during a necropsy to determine the cause of death for a massive die-off of murres in 2015/2016.
Emaciated Common Murre lays on the laboratory table
Emaciated Common Murre lays on the laboratory tableAn emaciated Common Murre lays on the laboratory table during a necropsy to determine the cause of death for a massive die-off of murres in 2015/2016.
Tufted Puffin, near Dutch Harbor in the Aleutian Islands, Alaska
Tufted Puffin, near Dutch Harbor in the Aleutian Islands, AlaskaTufted Puffin, the species most affected by a recent seabird die-off in the Pribilof Islands, AK. Near Dutch Harbor in the Aleutian Islands, Alaska
Tufted Puffin, near Dutch Harbor in the Aleutian Islands, Alaska
Tufted Puffin, near Dutch Harbor in the Aleutian Islands, AlaskaTufted Puffin, the species most affected by a recent seabird die-off in the Pribilof Islands, AK. Near Dutch Harbor in the Aleutian Islands, Alaska