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Conchoidal fracture in obsidian
Close-up view of conchoidal fracture in obsidian -volcanic, rhyolitic, glass. View is about 5 cm across. (191215-7)
Download Imagemylonite
Close-up view of mylonitic granitic rock. View is about 5 cm across. (191215-5)
Download ImagePit Crater at Diamond Craters, Oregon
Pit Crater at Diamond Craters, Oregon (191209-78)
Download ImagePahoehoe basalt and recent lava flow, Oregon
Pahoehoe (ropy) basalt and recent lava flow, Diamond Craters, Oregon (191209-54)
Download ImageGlass Butte, Oregon (pan)
Panorama view of Glass Butte, Oregon, the highest point of the Glass buttes, a rhyolite dome complex in central Oregon. (191209-50)
Download ImagePanoramic view of eastern Oregon (Pan)
Panoramic view of eroded volcanic landscape, eastern Oregon (191209-2)
Download ImageHoriz columnar joints in basaltic dike, Oregon
Horizontal columnar joints in basaltic dike, Owyhee Reservoir, eastern Oregon (191208-172)
Download ImageOwyhee River Canyon, eastern Oregon
Owyhee River and Canyon, framed by Owyhee basalt, eastern Oregon (191208-154)
Download ImageHoriz columnar joints in basaltic dike, Oregon
Horizontal columnar joints in basaltic dike, Owyhee Reservoir, eastern Oregon (191208-126)
Download ImageBasaltic dikes, Oregon (vertical)
Basaltic dikes cutting volcaniclastic rock, eastern Oregon. Note the baked and altered edge of the country rock (191208-97) igneous, intrusive
Download ImageBasaltic dike intruding lahars, Oregon
Basaltic dike cutting volcaniclastic rock, eastern Oregon. Note the baked and altered edge of the country rock as well as the chilled margin along the edge of the dike (191208-89) igneous, intrusive
Download ImageBasaltic dike intruding lahars, Oregon
Basaltic dike cutting volcaniclastic rock, eastern Oregon. Note the baked and altered edge of the country rock as well as the chilled margin along the edge of the dike. Rock hammer for scale. (191208-86) igneous, intrusive
Download ImageBasalt flows and volcaniclastic rock, Oregon
Owyhee Basalt and interbedded volcaniclastic rock, Oregon (191208-79)
Download ImageBasaltic dike intruding lahars, Oregon
Basaltic dike cutting volcaniclastic rock, eastern Oregon. Note the baked and altered edge of the country rock as well as the chilled margin along the edge of the dike. Rock hammer for scale. (191208-73) igneous, intrusive
Download ImageBasaltic dike intruding lahars, Oregon (vertical)
Basaltic dike cutting volcaniclastic rock, eastern Oregon. Note the baked and altered edge of the country rock as well as the chilled margin along the edge of the dike. The dike fed the basalt flows (Owyhee Basalt) in the background. Rock hammer for scale. (191208-71) igneous, intrusive
Download ImageBasaltic dike intruding lahars, Oregon
Basaltic dike cutting volcaniclastic rock, eastern Oregon. Note the baked and altered edge of the country rock as well as the chilled margin along the edge of the dike. The dike fed the basalt flows (Owyhee Basalt) in the background. (191208-69) igneous, intrusive
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Flow-banded rhyolite, Oregon
Flow-banding in rhyolite and obsidian, Oregon (191208-55)
Download ImageOwyhee River and Canyon, Oregon
Owyhee River and Canyon, Oregon. Canyon walls are Owyhee basalt, Oregon (191208-6)
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