Mount 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 ImageWaterfall and Wanapum basalt, Oregon (vertical)
North Falls at Silver Falls State Park, Oregon. It spills over a flow of Wanapum Basalt. The alcove behind the falls is eroded along recessive sedimentary rocks that lie between the Wanapum and underlying Grande Ronde Basalt. (150119-24)
Download ImageFolded ribbon chert and sea stacks, Oregon
Folded ribbon chert and sea stacks at Rainbow Rock, southern Oregon coast (111207-16)
Download ImageFolded ribbon chert and sea stacks, Oregon
Folded ribbon chert and sea stacks at Rainbow Rock, southern Oregon coast (111207-4)
Download ImageCoffee Pot cinder cone, Oregon (Pan)
Panorama photo of Coffee Pot cinder cone, Jordan Craters Lava field, eastern Oregon (IP2006-7351)
Download ImageCoffee Pot cinder cone, Oregon
Side of Coffee Pot cinder cone, Jordan Craters Lava field, eastern Oregon (IP2006-7349)
Download Imageplunging anticline, SW Montana
Aerial view of plunging anticline in Mesozoic rock, SW Montana (D200609-6)
Download ImageAnticline-syncline pair, SW Montana
Anticline-syncline pair in Cretaceous limestone, SW Montana (D200609-4)
Download ImageSuccor Creek and rhyolite cliffs, Oregon
Succor Creek, Oregon. The canyon is framed by cliffs of Miocene McIntrye Rhyolite (200612-113)
Download ImageRhyolite dike intruding tuff, Oregon
Rhyolite dike intruding Tuff of Leslie Gult, Oregon. Note the horizontal cooling fractures in the dike (200612-107)
Download ImageRhyolite dike intruding tuff, Oregon
Rhyolite dike intruding Tuff of Leslie Gult, Oregon. Note the horizontal cooling fractures in the dike (200612-104)
Download Image