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D11 Home
"To the dull mind all nature is
leaden. To the illumined mind the whole world burns and sparkles with light." --
Ralph Waldo Emerson
| |
Jack's
Earth Science Picture of the Day Submissions
| This rock likely
demonstrates contact metamorphism -- an igneous/granitic side and a gneiss
(metamorphic) side. On the igneous side it is easy to spot pink feldspar and
some large quartz crystals. The metamorphic side shows the results of the
application of extreme pressure over a very long time, producing a
metamorphosis ("change in form") that nevertheless did not involve the
melting of the rock, which would have resulted in more igneous rock rather
than the metamorphic. The pressure was likely applied by the intrusion
of the molten igneous rock into small cracks throughout a formation of
already solid igneous rock, which then was changed by the process of
Contact Metamorphism into gneiss.
See EPOD
for more information. |
 |
| A close-up of the pillar. |
 |
| Click on this thumbnail to see the
National Park
Service's Plaque that explains this glacial valley. |
 |
Images and Text Copyright © 2003 by John R. Carlson, unless
otherwise stated.
Permission for reuse for educational and non-profit purposes is
given
with the understanding that any reuse will credit me as the creator.
I
retain copyright to this content and any commercial reuse requires my
permission.
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