Search for any geological feature below
–then click on the image to see a larger version in its correct format, a more detailed caption, and an ID number.
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SOME POINTERS:
Photos typically include their locations, so you can use locations as keywords too. You get more hits with shorter words, and fewer hits as you become increasingly specific with increasing numbers of keywords. It’s best to use singular rather than plural (eg “volcano” instead of “volcanoes”).
As some words are included in others (“salt” within “basalt,” for example) you might want to be more specific to avoid getting a bunch of irrelevant photos.
Or you can just scroll down and see the most recently added photos… Enjoy!
Phreatic explosion crater. Death Valley, CA.
Phreatic explosion crater. Ubehebe Crater, Death Valley National Park, California. (Ig-107).
Download ImageMetamorphosed pillow basalt (vertical)
Metamorphosed pillow basalt (Purcell Lavas–greenstone), Glacier National Park, Montana. (Ig-105)
Download ImageMafic dike cutting sedimentary rock.
Mafic dike intruding sedimentary rock, SE California. (Ig-12)
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Phreatic explosion craters. Death Valley, CA
Aerial view of Ubehebe Craters, a small field of some 13 phreatic explosion craters, the largest of which is Ubehebe Crater itself. These craters formed when rising basaltic magma encountered groundwater and flashed to steam. (Ig-108).
Download ImageVolcanic rock thin section
Photomicrograph of basalt showing plagioclase phenocrysts. (Ig-101)
Download ImagePahoehoe lava, Hawaii. (vertical)
Active basaltic lava flow on Kilauea volcano, Hawaii. (Ig-103)
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Granitic dike intruding gneiss, WY.
Granitic dike intruding gneiss, Grand Teton National Park, Wyoming.
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Road covered lava flow, Hawaii.
Aerial view of road covered by recent basalt lava flow, Hawaii. (Ig-100)
Download ImagePegmatite intruding gneiss , California
Note how irregular the contact is between the two, and the small sill of pegmatite intruding along foliation in the gneiss. (Image ID # Ig-08)
Download ImageIntrusive contact, Sierra Nevada, CA
Intrusive contact: granitic rock and metasedimentary rock in roof pendant. Sierra Nevada, California. (Ig-07)
Download ImageIntrusive contact, Sierra Nevada, CA
Intrusive contact: granitic rock and metasedimentary rock in roof pendant. Sierra Nevada, California. (Ig-05)
Download ImageIntrusive contact: southern Sierra Nevada.
Cretaceous granodiorite can be seen intruding Triassic metavolcanic rock of the southern Sierra Nevada. The volcanic rock was contact metamorphosed by the intruding granite.(Image ID# Ig-06)
Download ImageSunrise on Mt. Whitney, CA.
Cretaceous Granodiorite. Mt. Whitney and Sierra Nevada, California. (Ig-02)
Download ImageCretaceous granodiorite, (vertical)
Cretaceous granodiorite, Yosemite National Park, California. (Ig-04)
Download ImageWillamette River, Oregon
Aerial view of meander bend in Willamette River, Oregon. (IMG_9256)
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Mt. Whitney: Cretaceous Granodiorite
At an elevation of 14,505, Mt. Whitney reaches the highest peak in the conterminous United States, and like much of the Sierra Nevada, it consists of Cretaceous granodiorite, a rock intermediate in composition between granite and diorite. (Image ID # Ig-01)
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