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.
and please, drop me a line if you find this site useful!
*****
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!
Diabase Sills, Mojave Desert, California
The green-colored rock in this photo is a 1 billion year old intrusion called diabase (chemically similar to basalt). Because it intrudes parallel to the layering in the country rock, it is called a sill. The country rock is the Proterozoic Crystal Spring Formation. Throughout the Death Valley region, talc deposits formed at the contact of the diabase sills and dolomite of the Crystal Spring Formation. Death Valley National Park. (Ig-21)
Download ImageDiorite sill (Purcell sill), Montana
Diorite sill (Purcell sill) intruding Precambrian Belt Supergroup. Note bleached zone on either side of sill that formed by contact metamorphism. Glacier National Park, Montana. (Ig-24)
Download ImageDiabase sill in marble, California
Diabase sill in marble, southern Death Valley National Park, California. Note the talc on the left side of the image. Ig-20.
Download ImageMafic dike and sill intruding marble.
Diabase dike and sill intruding marble, Death Valley, California.
Download ImagePegmatite sill intruding gneiss.
Pegmatite sills in Precambrian gneiss, northern Colorado. (5D-5917)
Download ImagePegmatite sill intruding gneiss. (vertical)
Pegmatite sill in Precambrian gneiss, northern Colorado. (5D-5910)
Download ImageGlacial headwall and igneous sill, Montana
Headwall of Proterozoic Belt Supergroup intruded by Purcell sill (diorite) behind the Grinnell Glacier in Glacier National Park, Montana. 4Gl-A)
Download ImageLeucosome in granulite gneiss, Greenland
Leucocratic sill in Proterozoic granulite gneiss, Aappilattoq, south Greenland. (230829-245)
Download ImageProterozoic pegmatite in schist, Colorado
Proterozoic pegmatite forming small sills in schist, Colorado (220916-99)
Download ImageGlacial striations and cirque, MT (vertical)
Glacial striations and cirque of Grinnell Glacier, Glacier National National Park, Montana. Note the dark-colored Purcell Sill and the waterfall on the headwall. (210724-57)
Download ImageGlacial striations and cirque, Montana
Glacial striations and cirque of Grinnell Glacier, Glacier National National Park, Montana. Note the dark-colored Purcell Sill and the waterfall on the headwall. (210724-55)
Download ImageProterozoic Grinnell Formation, MT (vetical)
Outcrop of Proterozoic Grinnell Formation, Glacier National Park, Montana. Purcell Sill forms the dark band in the glacial headwall in the background. (210724-17)
Download ImageProterozoic Grinnell Formation, Montana
Outcrop of Proterozoic Grinnell Formation, Glacier National Park, Montana. Purcell Sill forms the dark band in the glacial headwall in the background. (210724-16)
Download ImageMt. Gould at sunrise, Glacier NP, Montana
Mt. Gould and Lake Josephine at sunrise, Glacier National Park, Montana. Note the Purcell Sill. (210724-6)
Download ImageStromatolites in dolomite, MT (Vertical)
Proterozoic stromatolites exposed on bedding surface of Helena Dolomite in cirque of Grinnell Glacier, Glacier National Park, Montana. Note the Purcell sill in the glacial headwall in the background. (150713-52)
Download ImageEngineer Mountain, Colorado
Engineer Mtn. Upper half of mountain consists of rhyolite sill; lower red beds consist of Permian Cutler Group (201004-47)
Download ImageHeadlands near Hug Point, Oregon (Pan)
View northward past Hug Point to Ecola Point, Oregon Coast. Note basaltic sill and small sea cave (180812-26)
Download ImageDiorite, weathered and fresh surfaces
Close-up view of diorite showing both weathered (top) and fresh surfaces. Penny for scale. Purcell sill, Glacier National Park, Montana. (130723-65)
Download ImageGreat unconformity, Grand Canyon, AZ
View of the Great Unconformity in the Grand Canyon. Towards the bottom of the photo, it’s a nonconformity between the Cambrian Tapeats Sandstone and the Proterozoic metamorphic rocks (notice the granitic sill); In the middle of the photo, it’s an angular unconformity where the Tapeats sits on top tilted Hakatai Shale. (180519-27)
Download Image
You must be logged in to post a comment.