A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Black Canyon Gneiss with pegmatite dikes, Black Canyon of the Gunnison National Park |
|---|---|
| Description | Near Gunnison, Colorado, the Gunnison River has eroded a deep canyon into ancient rocks. The walls of the Black Canyon of the Gunnison are made predominately of Precambrian Black Canyon Gneiss. The gneiss is cut by dikes of a pinkish pegmatite. The dikes that are easily seen in this picture run parallel to the foliation of the gneiss, but that is not always the case. |
| Chronostratigraphy | Precambrian |
| Location | USA ▹ Colorado ▹ Gunnison. Near Gunnison. |
| Photographer | Dexter Perkins. 1999. |
| Collection | E181030992F-22. |
| Key words | gneiss, dike, precambrian, Black Canyon |
| Tech details | 511 KB. Vista. Canon EOS Rebel, 55mm, Kodak Elite Chrome 100 ASA. |
| GeoDIL number | 1730 |
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