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Obsidian flow and South Sister, OR.
Obsidian flow and South Sister stratovolcano, Oregon (Ig-55).
Download ImageCaldera. Long Valley caldera, CA.
Aerial view of Long Valley caldera, Caldera. (Ig-57).
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Crater Lake and Wizard Island, Oregon
Crater Lake and Wizard Island, Oregon –a caldera and post-collapse cinder cone. Crater Lake National Park. (Ig-51)
Download ImageCrater Lake, a 7700 year old caldera.
Caldera and cinder cone: Crater Lake and Wizard Island, Oregon. Crater Lake National Park. (Ig-52)
Download ImageCascade Volcanoes, Oregon.
Aerial view of Cascade Volcanoes, Oregon, looking south. From left (north) to right, Mt. Washington, Belknap Shield Volcano, and Three Sisters. Note snow-covered lava flows near center. (Ig-48)
Download ImageGeologists in Mt. St. Helens crater (vertical)
Geologists in crater of Mount St. Helens, Washington in 1982.
Download ImageRhyolitic obsidian flow, Oregon.
Aerial view of Rhyolitic Obsidian Flow, Newberry Volcano, Oregon. Ig-49.
Download ImageThree Sisters volcanoes, Oregon
Aerial view of Three Sisters stratovolcanoes, Oregon. Photo also shows Broken Top Volcano and Bachelor Butte on the left side background. (Ig-47)
Download ImageMount St. Helens and Mt. Rainier, WA.
Aerial view of Mt. St. Helens and Mount Rainier looking north, two Cascade Stratovolcanoes in Washington. Ig-46.
Download ImageCrater and dome of Mt. St. Helens, WA.
Crater and dome of Mt. St. Helens, Washington. (Ig-44)
Download ImageMount Rainier and summit crater.
Aerial view of Mount Rainier stratovolcano and summit crater and glacier. Mount Rainier National Park, Washington. (Ig-39).
Download ImageMt. Hood, OR. View North to Mt. Rainier, WA.
Aerial view of Mount Hood, Oregon. View North to Mount Rainier, Washington. (Ig-42)
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Purcell sill, Glacier National Park, Montana.
The dark band in this cliff face is the Purcell Sill, and diorite sill that intrudes rock of the Proterozoic Belt Supergroup in Glacier National Park. The white rock on either side of the sill is bleached because of the contact metamorphism. (Image ID# lg-25)
Download ImageLayered intrusion, Stillwater Complex, Montana
Stratified cumulate minerals, Stillwater Complex, Montana. Dark layers are mostly pyroxene; light ones are plagioclase. (Ig-35)
Download ImageMt. Rainier stratovolcano, Washington.
View westward from Sunrise towards the Emmons Glacier. (Ig-38).
Download ImageSlate inclusions in granite, Wasatch Mtns., Utah.
Slate inclusions in granite, Utah. (Ig-30).
Download ImageMt. Rainier stratovolcano, Washington.
Aerial veiw of glacier covered Mount Rainier, WA. (Ig-37)
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