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Folded ribbon chert, Washington
Folded ribbon (radiolarian chert, North Cascades mountains, Washington (200907-14)
Download ImageMount Baker volcano, Washington
Mt. Baker, a glacier-covered stratovolcano in northern Washington (200907-7)
Download ImageMount Baker volcano, Washington
Mt. Baker, a glacier-covered stratovolcano in northern Washington (200907-5)
Download ImageMt. Hood and pyroclastic deposits (vertical)
Mount Hood, Oregon and pyroclastic deposits of the Timberline and Old Main eruptive periods (200905-8)
Download ImageMt. Hood and pyroclastic deposits
Mount Hood, Oregon and pyroclastic deposits of the Timberline and Old Main eruptive periods (200905-6)
Download ImageLava Butte cinder cone, Newberry, Oregon
Lava flow and vent from a cinder cone, Lava Butte, Oregon (200313-118)
Download ImageVolcanic bomb interior, Newberry, Oregon
Interior of a volcanic bomb, highly vesiculated from expanding gases. Lava Butte Cinder Cone, Newberry volcano (190608-67)
Download ImageLithophysae in Ash Flow Tuff, Oregon (vertical)
Lithophysae in Rattlesnake Ash Flow Tuff, Oregon (181017-3)
Download ImageMt. Hood stratovolcano, Oregon
Mt. Hood and its fan of pyroclastic material, deposited during a sector collapse between 1700-1400 years ago. (130901-49)
Download ImageView into collapsed sea cave, Oregon
Hikers standing in a collapsed sea cave at low tide, Devils Punchbowl, Oregon (130428-18)
Download ImageMount Washington, Oregon Cascades
Mount Washington, the eroded volcanic neck of a shield volcano in the Oregon Cascades. (200704-26)
Download ImageVolcanoes of the Oregon Cascade Range
Volcanoes of the Oregon Cascade Range, view northward. Snow-capped peaks are Hood (far left) and Jefferson (center). Three-Fingered Jack, an eroded shield, is just right-of-center. Hayrick Butte, a Tuya, forms the flat-topped feature in the middleground. (200704-4)
Download ImageShield Volcanoes, Oregon
Mount Washington (left) and Belknap Crater (right), two basaltic shield volcanoes in the Cascade Range of Oregon. Mt. Washington, long extinct, is a deeply eroded neck whereas Belknap is much not eroded because it’s much younger. Twin Craters, a cinder cone, occupies the right middleground. (200704-2)
Download ImagePyroclastic flow at the Pinnacles, Crater Lake, OR
Pyroclastic flow (Ash flow tuff) from the 7700BP eruption of Mt. Mazama at the Pinnacles, Crater Lake National Park, Oregon. (08-8645)
Download ImageThe Pinnacles, Crater Lake, OR (vertical)
Pyroclastic flow (Ash flow tuff) from the 7700BP eruption of Mt. Mazama at the Pinnacles, Crater Lake National Park, Oregon (08-8644)
Download ImageFlow-banded rhyolite, Crater Lake, OR (vertical)
Flow-banded rhyolite (with obsidian), Crater Lake National Park, Oregon (08-8640)
Download ImageClose-up view of pumice
Close-up view of pumice, a highly porous volcanic rock. It’s made of glass shards fused together during explosive eruptions. (110405-A5895)
Download ImageRussell Glacier on Mt. Jefferson, Oregon
Russell Glacier and crevasses on Mt. Jefferson, an eroded Cascade stratovolcano, Oregon (5D-8290)
Download ImageFolded ribbon chert , Oregon
Folded ribbon chert of the Franciscan Assemblage, Rainbow Rock, southern Oregon coast (190504-91)
Download ImageSouth Falls, Silver Falls State Park, Oregon
South Falls spills over a flow of Wanapum Basalt at Silver Falls State Park, Oregon. The Alcove behind the falls formed by differential erosion of a recessive sedimentary rock unit between it and the underlying Grande Ronde Basalt. (190420-37)
Download ImageBasalt at Middle N Falls, Silver Falls, OR (square)
Grande Ronde Basalt at Middle North Falls, Silver Falls State Park, Oregon (150119-83)
Download Image
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